Looks like you have the same truck and trailer weight as I do. I have a 2020 GMC AT4 3500 srw cc long bed. When I ordered the truck the GM website said it would have a payload of over 4,000# pounds however when it came in the door sticker says max payload 3,645# and 5th wheel pin weight 3,165#. My trailer is an 2018 Raptor 355 GVW17,000#.I did add air bags and replaced the Rancho shocks with Bilstein shocks and I have to say it is a very pleasant tow experience. I put 25# of air with no toys in and 20# loaded with toys. With SRW you need to pay more attention to tire capacity. the tires that came on my truck are rated at 3,750 per tire at 7500 rear tire capacity I'm way below tire capacity and slightly over pin weight.