RWTJR

I agree this is probably the case. Below are links to two different 275/65/R18 DuraTrac tires with very similar load capacity (both not E rated). One is OE (slightly less load capacity) and the other is not (slightly more load capacity). These tires are so close in numbers it leads me to believe it's the GM TPC Spec (spec's compound?) that effects the 3PMS rating. https://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+DuraTrac&partnum=765SR8WDT https://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+DuraTrac&sidewall=Blackwall&partnum=765QR8WDTV3&tab=Specs So of the three (3) 275/65/R18 DuraTrac tires Goodyear makes, the OE (GM spec'd) tire has the least load capacity and is not 3PMS. Oh, and they cost the least. Getting back to the OP's question about snow performance of his 275/60/20 Trailrunners, they are not 3PMS rated and they don't even make a 3PMS rated version of the Trailrunner. Therefore, I wouldn't expect much from them in the snow. IMHO, the Trailrunners are not even much of an A/T tire. However, the OP did better than I did, my Z71/RST came with Fortitude HT (Highway-Terrain) tires that GM says are All-Terrain tires. In Goodyear, the best A/T with winter traction for the op's truck is probably going to be the 275/60/20, 3PMS, rated Duratrac. Personally, I wouldn't replace the Trailrunners with another Goodyear tire. I would probably go back to the Pirelli Scorpian AT Plus I had on my last truck or the Cooper AT3 4S (both 3PMS). Both also come in 275/60/20 size. Thanks for indulging me as I ramble on. JMHO No expertise implied or expressed

You should have the L84, 5.3L with Dynamic Fuel Management (DFM). DFM engines have never had any notification/indication of cylinder activation/deactivation. DFM is continually changing between 17 different cylinder patterns (activation/deactivation). https://gmauthority.com/blog/gm/general-motors-technology/general-motors-propulsion-technology/general-motors-dynamic-fuel-management-cylinder-deactivation-technology/

Makes perfect sense. I knew the DFM didn't have any notification/indicator because of the multiple quickly changing cylinder configurations but I was unaware they removed the notification on the AFM engine equipped trucks. Thanks No expertise implied or expressed

Hmm. I read the L83, 5.3 (AFM) was only available in the 2019 classic and the L82 5.3 (AFM) was being used in the lower trim levels of the new gen Silverado and the L84, (DFM) in the higher trim levels. I just popped over to the 2021 Silverado configuration page and configured a WT Trim truck with the 5.3L AFM and 6 speed transmission. Page can be found here: https://www.chevrolet.com/trucks/silverado/1500 Or you can just click on the 5.3L icon and it will show both the L82 and L84 availability. The page says the 5.3l (L82) with AFM engine is available on the WT, Custom and Custom Trail Boss trim levels. JMHO No expertise implied or expressed

Not true. If the OP has AFM (L82 5.3L) instead of DFM (L84, 5.3L or L87, 6.2). AFM is V4 or V8, DFM has the algorithm. Both AFM and DFM are used in 2019 and up 5.3L trucks dependent on trim level. JMHO No expertise implied or expressed

Build sheet should read RPO Code: QT5 - EASY LIFT, POWER LOCK AND RELEASE TAILGATE.

Which engine do you have?

I am not so sure this is accurate. According to the Goodyear website the DuraTracs are Severe Snow Certified (3PMS) except LT275/70/R18 Goodyear website - shown under "Features" last bullet point (Winter Performance) in right column: https://www.goodyear.com/en-US/tires/wrangler-duratrac?year=2020&make=GMC&model=Sierra 1500&vo=Elevation&ctid=166898 Below are non load range E rated DuraTracs found on Tire Rack that are 3PMS (Sever Snow Certified): The 275/60/R20 (not E rated) size tires the OP has on his on his GM Elevation are Severe Snow Certified (3PMS) in the DuraTrac : https://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+DuraTrac&sidewall=Blackwall&partnum=76SR0WDT&tab=Specs These 265/65/R18 that would fit my Z71/RST are 3PMS rated, they are neither an LT or E rated: https://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+DuraTrac&sidewall=Blackwall&partnum=665SR8WDT&tab=Specs Both tires above are GM sizes but not GM's TPC spec tires. Neither of the tires above are E or LT rated but both are 3PMS rated (according to both Tire rack and Goodyear). The OEM DuraTrac tires (TPC spec) may not be 3PMS rated but based on the above it's not because they aren't load rate E. Goodyear makes plenty of 3PMS DuraTracs in non E load sizes GM could use. GM probably spec's a non 3PMS A/T tire to have less rolling resistance/better mpg (different compound or something). JMHO No expertise implied or expressed

I too change my oil at 1000-1500 miles the first time and my gear lube in the diffs at 10k. Is it necessary, no. Is it probably wasteful, yes. Do I care, no. Why? Because it makes me feel better. I say do it if it makes you feel better about protecting your investment. JMHO No expertise implied or expressed

Watch the whole video.

Me too. That might just be because I think the dual exhaust outlets on the Silverado look cheap and cheesy.

Hah! Leave it to GM to spec the tire so that it's not 3PMS. They must have wanted either better mpg, softer ride or a quieter tire. No expertise implied or expressed.

The DuraTracs are Three-Peak Mountain Snowflake (3PMS) rated, the TrailRunners are not. IMHO, if driving is snow a 3PMS A/T tire is a must. JMHO No expertise implied or expressed

Really should be called a "Dual Outlet Exhaust" but GM never misses a chance to use some deceptive verbiage. (Like my Highway Terrain (HT) tires on my Z71 package that GM claims are All Terrain (AT) tires) It is really just an appearance package as the exhaust is fundamentally/functionally the same. The RPO code is "N10- EXHAUST, DUAL WITH POLISHED OUTLETS". Again it's not a dual exhaust regardless of what GM chooses to call it. It's a single exhaust with dual outlets. JMHO No expertise implied or expressed

Passenger side seat back storage has a first aid/trauma kit, driver's side has two North Face rain jackets folded up nicely inside.

Any of these help? https://www.gmpartsgarage.com/p-hot-deal-2-inch-gm-lift-kit-84629787-liftkit https://www.gmpartsxperts.com/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243 https://www.gmpartscenter.net/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243 https://www.suburbanautoparts.com/oem-parts/gm-performance-suspension-lift-trail-boss-4wd-84768243?c=az0xJnE9ODQ2Mjk3ODc%3D

Very Nice!

https://www.etrailer.com/p-MT70234.html?hhyear=2020&hhmake=Chevrolet&hhmodel=Silverado+1500

Sorry to say, I get to join the club. 2020, RST/Z71, 5.3, build date 8/1/2020. I guess I'll be dropping by the dealership next week to schedule a fix.

I can't speak for the OP but one of the reasons I have the Du-Ha is because the OEM model is smaller. If you look at the DU-HA in the first picture above you'll see it extends forward of the big ridge in the OEM floor liner. If you look at the OEM model in the picture at the link below, you'll see that it does not extend past that same ridge. The Du-Ha is huge. https://www.gmpartsclub.com/oem-parts/gm-cargo-under-seat-organizer-84525974?origin=pla&utm_term=&utm_campaign=Catalog+Smart+Shopping&utm_source=adwords&utm_medium=ppc&hsa_acc=1931327731&hsa_cam=9158758542&hsa_grp=87904691250&hsa_ad=414787673482&hsa_src=u&hsa_tgt=pla-293946777986&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gclid=EAIaIQobChMI7Zav7eb77QIVx1PVCh15AwSWEAQYBiABEgL2lvD_BwE JMHO No expertise implied or expressed

I think I can help with a couple of these questions/issues. First the steering is electric so there isn't any power steering fluid. When using remote start, the heated seats don't heat well if unoccupied and the heated seats are cancelled when the ignition is turned on. So, you have to manually turn it up when you get in the truck (See page 64 of the Manual linked below). Here's a copy of your manual: https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2019/Chevrolet/silverado-1500ld/2019-chevrolet-silverado-1500-ld-2500-3500-owners-manual.pdf JMHO No expertise implied or expressed

Toy Hauler tongue weights are always high to offset the weight of the toys/cargo loaded behind the trailer axles which reduces the tongue weight. Due to design differences in different brands of toy haulers there is no real formula. Let's assume on average, 2.5 lbs of added weight behind the trailer axles will reduce hitch weight by approximately 1 pound. This is not accurate because a toy hauler by one manufacturer is going to have different axle placement from another and the farther back the loaded weight the bigger the change, etc., but it illustrates how the tongue weight changes with toy/cargo loading behind the trailer axles. So using the above concept; if a 6000 lb toy hauler had a 1100 lb unladen tongue weight and 800 lbs of dirt bikes was added behind the axles of the trailer, the tongue weight would be reduced by 320 lbs making it 780 lbs or about 11.5% of the 6800 lb trailer weight and well within the hitch weight restrictions and a pretty balanced load. Conversely, if the dry, unladen hitch weight was 900 lbs and and was reduced by the same 320 lbs it would have a 580 lb hitch weight or about 8.5% of the 6800 lb trailer and it would be too light and sway. Of course other cargo, accessories, etc., loaded forward of the axles will increase the tongue weight ****Please Note: This is just for illustration purposes. The trailer should be loaded as it will be towed and the actual tongue weight measured.**** Again, this is not accurate and is just to illustrate a point. DO NOT use these actual numbers or weight distribution formula in determining trailer or hitch weight. It seems feasible a a 6000 lb dry weight toy hauler could be properly loaded to bring the hitch weight into the 10%-15% trailer weight range and not exceed the hitch or the truck published limitations. See page number 14: https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/vehicle-groups/trailering-and-towing/trucks/02-pdfs/2020-chevrolet-trailering-and-towing-guide.pdf JMHO No expertise implied or expressed

Don't be surprised if they refuse to perform a TSB for transmission shudder on a vehicle that is not experiencing shudder. You may have an issue that is repairable under warranty but if it's not shudder this TSB doesn't apply. My previous truck was a 2018 Colorado with the 8 speed and some Colorado owners tried getting non-shudder issues addressed by the 18-NA-355 TSB, https://static.nhtsa.gov/odi/tsbs/2019/MC-10163890-9999.pdf , (same issue, earlier TSB) and almost always were denied. Some would complain of harsh shifting and the dealer would say No to the TSB. Many who had shudder reported shift improvement in addition to shudder elimination after the TSB. The July 08, 2019 update of the TSB removed the requirement for PicoScope testing or other diagnosis beyond owner complaint of Shudder BUT it had to be a complaint of shudder (not gear hunting). Good luck. Let us know what they say. JMHO No expertise implied or expressed

Thanks for the follow up. I am afraid that's the nature of intermittent issues and diagnosis. I wonder if the passive locking is being overridden or signal blocked some way. I know the passive locking can be temporarily overridden by holding the unlock button down (there also may be some unpublished way). When this happens it won't passively lock until the next time the ignition switch is cycled (truck started). I manually override mine when cleaning or working on/in the interior. Or maybe some radio signal/interference that doesn't allow the system to recognize the FOB has moved out of the proximity range? You noted a correlation between failure to lock and a back door. Any other consistencies, location of occurrence, could a second FOB be near (significant other's purse or pocket) amount of time the door is open, etc., etc.? When it doesn't lock passively does it easily lock using the FOB? Next time try walking up next to the door (to establish signal) then walk far enough away that it should lock. If it does lock, it may indicates a signal issue. If that doesn't work try opening and closing the door, or doors, then walk away and see if it locks. it may indicate the system is not recognizing all the doors are closed (or maybe all the doors aren't closed). Last try, starting the truck, turn it off, exit and close the door, walk away and see if it locks. If it locks, it may indicate the passive locking was overridden somehow and reset by cycling the ignition. Or any/all of this could be useless as I have no clue what I'm talking about. I use passive locking all the time on both my truck and Camaro, so far without issue. I would miss the convenience if it wasn't reliable. I never have to think, did I lock the doors? Please let us know if you get it figured out. JMHO No expertise implied or expressed

So, what did the dealership say?