I have had no problem with wandering. I have a solid front axle with an aftermarket steering brace. I think your truck is ifs. This should resist wandering better than my truck.
I have a Torklift SuperHitch for towing extension for my Jeep/trailer. I have to run my spare tire at Zero psi. My truck and Jeep each have on board Air. I also had to slightly modify the under bed bracket for the spare tire.
I have seen older Chevy Trucks with Vision wheels. The few I've talked too were very happy. I probably won't decide which tire is next for me until late April. I do run the factory rims during the winter. This allows good snow tire traction. My truck is back to daily driver status. We just lemon law'd the wife's vehicle.
When empty, I run the 19.5's at about 60psi. Full pressure:
Front 85psi
Rear 110 psi
Also look into Torklift Stable loads in stead of air bags.