ApertureX

Coming Soon: https://bankspower.com/products/63369-63379-idash-stealth-pods-22-gm?variant=42150425821381

The NAV TV unit just like any other integration piece for cars and trucks, just reads the data signal and then create its own output. So if their warning chimes are multiple one second beeps then that’s what you get. I’ve heard that NAV TV’s customer service is pretty good. If you have questions about the unit, or what may have changed since it was installed, I would recommend giving them a call.

I believe the warning message at the beginning of this video will answer your question:

The 2021 HD step do come down. 2:27 on the video:

Personally I’m very curious about peoples’ experience with the Bilstein shocks both the 4600 and 5100. I’ve heard a lot of good things about them, but I’ve never tried them myself. Apparently the 5100 are better if you are loaded with payload and the 4600 are better for SRW and the 5100 are better for dually. Does anyone have experience with either of these, and on which truck?

I used to say the same, until I heard Morel speakers and I'll never go back.

You didn’t specify gas or diesel, so here is the MBRP for the 6.6 Gas: YouTube Link

Well they put up the online build and price today for the 2021 on http://www.GMC.com so have fun!

Yep. No need to add holes to the door when you can mount the tweeters in the dash and get a good sound. The PAC Audio (a.k.a. Best Kits) speaker mount adapters actually come with the adapter mount to put a tweeter in the dash location. https://catalog.pac-audio.com/catalog/installation-accessories/2014-2020-general-motors

B&W released new hitches to work with the Multi-Pro Tailgate at SEMA: https://www.bwtrailerhitches.com/product/multipro-tow-stow

Looks like NAV-TV has come out with a Zen interface that should allow you to replace the Bose amplifier and have line level out or optical Toslink (S/PDIF) output from the stick 8" head unit. I'm personally interested in what PAC will come out with, but this opens up many possibilities for aftermarket audio. https://navtv.com/products/NTV-KIT955/zen-avb-gm.html

They do not record.

The transmission for the HD's was co-developed by GM and Allison (built to Allison specs) but it is built by GM. It says Allison because it meets Allison specs and they passed their testing. Therefore officially, according to GM, it is an 'Allison branded 10-speed transmission'. The 10-speed for the 1500 was a co-development between GM and Ford.

$650 isn't bad for all 4. Worth it to remove the plastic that will dry out and turn grey just like on the Chevy Avalanche.

No. You will have to wait for the aftermarket to make fender flares without the lights.