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2020 Onyx Black-on-Jet Black GMC Sierra 2500HD SLE Crew Cab - Cloth Front Bucket Seats - Long Box - 4Wheel Drive - "L8T" Gas Moto Metal 20"x9" wheels with +18mm offset: Model MO993 HYDRA Part# MO99329088218 Chrome eight point star, deep lip design with red inserts BFGoodrich T/A KO2 285/65R20 127S E1 BSW tires N-FAB podium stainless steel side steps: Part# #HPC1980CC-SS Highway Products truck bed rails

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GM-Trucks.com Members: My 2020 GMC 2500HD came from the factory with 17-inch wheels & tires. I replaced them with 20-inch wheels & tires. My WAZE navigation app shows a ~5-mph difference with my speedometer. Can GMC mechanics re-program my speedometer for 20-inch wheels & tires? Also, are my tire pressure sensors calibrated for my factory 17-inch wheels & tires? Do my tire pressure sensors also need to be re-calibrated for my 20-inch wheels & tires? Thank you in advance for any guidance you can offer. Much obliged.

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https://www.highwayproducts.com/p/truck-bed-rails/

On two occasions since I took delivery on 02/14/20, the batteries in my 2020 GMC Sierra 2500HD SLE Crew Cab, Long Box, 4WD, L8T Gas Engine truck have inexplicable gone dead. My truck is equipped with optional Dual Alternators and 220-amp Primary Battery & 170-amp Auxiliary Battery. I have not identified the source of the battery drain. Has this phenomenon happened to any other GM-Trucks.com members? Can anyone offer any advice on how to diagnose the problem? Much obliged & kind regards.

I returned Great Day Center-Lok Overhead Gun Rack model CL1501 (for i Rifle) because I was afraid it would interfere with side air bags.

I have 285/65R20 BFG KO2 tires with Moto Metal 20x9 +18 wheels on my stock 2020 GMC Sierra HD with no problems.

GM-Trucks.com Members: Have any of you installed the Great Day Center-Lok Overhead Gun Rack for Trucks in a 2020 GMC Heavy Duty truck? http://greatdayinc.com/products/truck-auto-jeep-accessories/center-lok-overhead-gun-rack-for-trucks/ If yes, please share your evaluation of the fitment. Much obliged. Kind regards. 04/05/20 Update: No responses. So I ordered the Great Day Center-Lok Overhead Gun Rack model CL1501 (for i Rifle). Upon receipt, I will post a fitment evaluation.

I’m happy to report that my 2020 Black-on-Black GMC Sierra 2500HD SLE CC LB 4WD "L8T” Gas truck was delivery on 02/14/2020 with Upfitter Switches Factory installed.

BMW only makes ONE thing: “The Ultimate Driving Machine”! GMC only makes ONE thing: “Denali Diesels”! Lowly SLE-Trim Level, Long Box, L8T Gas Engine Trucks are definitely at the BOTTOM of GMC’s Priority List!

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