I have basically the same truck- 2021 2500HD Duramax. I haul a 39' Genesis 5th wheel Toyhauler that loaded is about 16k (hauls great, even in the mountains) I run air bags based on the heavy 3k+ kingpin weight, but I don't belive you will need them with the older Weekend Warriors if you go that route to save $$$. (If your trailer squats the back, then buy bags).
As far as cab to trailer turning clearance, the Anderson and Pullright style hitches can offset the trailer king pin forward for additional clearance (I run the Pullrite), and they are very light/easy to remove from bed. They have a style available that essentially clamps right to a Gooseball (sold separately, i use a Curt) since you already have that truck option. That's a nice fast and effective setup for your truck.
If possible, go 5500 Onan generator on a trailer as it is quieter/smoother, and obviously more powerful.
Solar, if not already installed is one of the best adds you can do. Batteries always fresh and last MUCH longer.
2 Full size Quads won't fit side by side, so look for plenty of cargo area.
I have had owned 5 different Toyhaulers (2 5th wheels/3 bumper pulls), and 5th wheel in my opinion is the only way to go.
Happy trailer hunting...
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