jhplak325

The snow plow prep/camper package does not include the trailer wiring provisions for 5th wheel/gooseneck, that is a separate $35.00 option when ordered from factory. Your only option would be to pick up a splitter like you are thinking.

You will have to get them from GM, trucks built between 3/21/22 to 4/4/22 the rear wheel liners wasn't included at the factory. That has since been changed.

OP is looking at Denali's and on Denali's and AT4's just say DenaliHD or AT4HD on the doors, no place on the truck does it say 2500 or 3500, has been like this since 2011 when the Denali was introduced to the HD line.

I had the same problem back in the middle of April after the dealer installed the illuminated sills, after some communication with GM about the issue, they released new installation instruction end of April and where you tap into for power is a different location. Dealer changed the location and have not had a problem since. illuminated sills 4-28-21.pdf

2019’s won’t fit and Chevy accessories website shows 84998769 for the rear wheel liners.

Dual batteries on a gas engine is not part of the plow prep package.

The trailer tire pressure sensors are an option from factory. If ordered from factory, the price is $50.00 for 4. If you buy them over the counter, then price is $150.00 for 2.

Some info - https://www.gmupfitter.com/files/media/photo/1466/UI Bulletin_170.pdf

Military, Educator and First Responder discounts are now only $500. Prior to this month they where the same as Supplier.

Thanks and you have a sweet setup also! Really impressed with the 10 speed and how smooth it shifts. Definitely like the turn signal cameras, but my biggest thing is getting used to them.

No difference in height between an AT4 and Denali on the HD’s.

I just got this a month ago and pulled the camper for the first time this past weekend, unloaded and loaded it rides a lot better than the 2015 GMC Sierra 2500 Denali HD I had. Really impressed with this truck. 2021 GMC Sierra 3500HD on stock tires.

Did you check the fuses? Park lamp left and park lamp right fuses are in the engine bay fuse box.

Here is someone that has attempted the 2nd battery install.

Looks like someone else has the same issue and posted about it yesterday