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There are no guarantees that you won't have a problem and DEF problems are the number one issue with all of the current diesels regardless of the brand. I don't know what percentage of trucks have had an issue and the manufacturers are not giving out those statistics. Judging from the posts here and on other forums, I'd guess that the number issues with Duramax diesels are small but they do happen. The major concern is that parts are scarce and some have waited for extended periods for the dealer to get a needed part. There seem to be shortages of many things today for an assortment of reasons. If the truck is mission critical you might want to go with the 6.6 liter gas engine that is standard in the 2500HD's. The gas engines have been very reliable and most like them. The drawback is that the 6.6 gas engine only comes with a 6 speed transmission. You might miss the 10 speed in you 1500. I only have 17,000 miles on my 20 Duramax and It has had no issues. I did drive it on a 6,500 mile loop across the country this fall and it was a joy to drive. Best of luck on your search.

Chevrolets don't have the problem. I'm grateful for that.

Some trailers with all LED lighting don't draw enough current to let the truck know it's there. I had this problem with my 2018 Airstream trailer with all LED lighting. The truck would see the trailer when first connected to the truck then lose the connection after I'd stopped and turned the ignition off. The problem was random and unpredictable. Like you, my lights and brakes all worked even though the truck was displaying the message. However, the trailer TPMS system did not work and the truck did not accumulate trailer mileage when it was not recognized. I read about Ford truck owners having similar problems on a Ford forum and found this 7 way plug adapter resolved their issues. I bought one and it works for me. I have not had a 'No trailer connected' error since. The plug apparently works by adding resistance to the lighting circuit. It's not expensive and might be worth a try. https://www.amazon.com/gp/product/B00C4AYR3U/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

The truck might be sensitive to a partially charged battery. You generally need to recharge the battery on a battery charger to bring it up to full charge. The alternator is more of a battery maintainer and takes a long time to fully recharge a battery. Make sure the battery has 12.7 volts after it's rested for an hour after charging and then try reprogramming the windows again.

Yes, many are and there are numerous posts here and on other forums. They work great! Have you done a search on them?

Are you asking about the diesel or gasoline engine options? Makes a difference!

Aren't those two things supposed to be powered off of the trailer battery? Maybe you have something other than a travel trailer but any trailer with interior lights normally has it's own battery.

I don't have the issues you are having, but I did put a little dielectric grease on the seal that prevents moisture from getting into the connection. It does make connecting and disconnecting the cable easier.

My guess is that they are drain holes used during the manufacturing process. The entire truck is submerged in a rust proofing liquid before the body is painted and the rust proofing has to drain after leaving the bath. Just a WAG.

I don't believe you need a catch can with a 6.6L gas engine. GM has a very efficient system built into the engine and it does an excellent job separating oil out of air going back to the engine.

Yes, they are removable. They clip-in much like the fender well trim pieces do. However, once removed they are generally replaced because they don't come off easily and are often damaged. I'd make sure the cap completely covers the area taken up by the bed rail caps before removing them. The end result might not be satisfactory if they don't.

I'm averaging about 600 mpg of DEF while towing a 30' Airstream trailer at 60 mph. That average was computed towing a little over 4,000 miles. The trailer weights about 8500 lbs.

HUD is a great feature. Others have listed the reasons in posts above so I won't repeat them. The windshield is specially made for the HUD and is more expensive if it has to be replaced. I had the windshield in my 04 Corvette replaced when it was almost new and the windshield for it was almost $1000.00 at the time. But then all damage is expensive on today's trucks and that's why we have insurance.

I imagine that it would have to be for short hauls only. Trying to get that combination into or out of anything but a truck stop would have to be a nightmare. There is no way to back it up without disconnecting the boat trailer.

Let us know how that goes. I have never heard of dealers having that ability so I'm all in to see if they can in fact add the features you want.

I don't know about LT trims but my LTZ has Task Lighting and that provides an LED light in the tailgate that lights the hitch area at night making hitching the trailer easier. From what I've read, camera features cannot be added if not installed at the factory. The reason the display is grainy is due to the system trying to display detail that isn't easily captured in low light. Even the best cameras struggle when there is too little light. The solution is to add a light either on the trailer or the truck that can provide the extra light needed for the camera.

Thanks gentlemen, you learn something new everyday!

The vertical bar to the right of the Average MPG gauge in the the dash cluster photo has eluded me. I think it has something to do with fuel mileage but I haven't seen a description in any of the manuals or other literature I've seen for the 2020 2500HD trucks. What is it and how does it work?

It's there on the passenger side about half way down from the top. It's hard to see because of the fan blade shroud and the belts. It's a tight fit and tough to get to. Put a long ½" breakover bar in the square hole and apply pressure to loosen tension on the belt. An assistant makes the job easier.

Well, that was certainly pushing it to the limit. Glad to hear you made it to a fuel stop in time. I carry a 5 gallon jerry can in the bed when traveling just to ensure I can add a little fuel when needed. I had a similar circumstance three years ago in the Mojave desert and I wasn't at all sure I'd make it to a station that had diesel. I did make it but it was close!

You didn't state the pin weight on your rig or what the door tag shows the max tongue weight to be. GCWR and total weight of the loaded trailer are also factors. You may well be overloaded. Air bags can help control the load but you might really need a 3500 for your load.

Foaming isn't it. I might get ½ gal more after waiting but that's about it. Auto makers do it for two reasons: 1 - to keep you from running out of fuel and 2 - to keep from burning out the fuel pump. The fuel pump is located in the fuel tank. The fuel cools the pump and If you run too low on fuel there is a good chance you will burn out the pump. There was no fuel pump on GM Diesels prior to 2017. The high pressure pump on the engine used vacuum to pull the fuel through to the engine. An in tank pump was added for the LP5 engines because they are more powerful and require more fuel. I don't have a problem with the way the gauge reads as long as I know there is X amount of fuel when the gauge reads low.

2020 LTZ Duramax 4x4

Many, maybe most cars and trucks with auto trans no longer have dipsticks. The trans are basically sealed and require no fluid checks. Ford and GM truck transmissions are sealed as well as most of the car transmissions. Fluid levels can be checked but you have to get the truck high enough into the air to get under it and check it from below. There is no need to check as long as there are no leaks. Corvette transmissions have been this way since 1997 so it's not something new.

GM is ahead in many ways: pickup bed is larger, built-in side steps allow easy access to the bed, bumper steps are superior to any other pickup, independent front end gives a better ride and there is no 'death wobble', camera system is far better than the others, multi-pro tailgate. I have a 2019 Ford Raptor with the carbon fiber dash inserts and all of the features. I never feel like I'm stepping down when I drive the LTZ - it's great truck!