Are you running tire pressures at the door sticker? That’s too high for a PW unless you’re loaded to the max.
I’ve usually been pleased with BFG KO tires, ran them in 35’s on my previous wagon.
This truck I decided to take a chance on Goodyear Duratrac, 35” E rated.
The good: they work well in all conditions, better in mud than the KO. The ride off road is smoother aired down. On road I’m running 40 f, 35r which gives a nice smooth ride.
The bad: they don’t balance as well as some. I’m on my third rotation and balance, and they’ve been prone to an intermittent minor shake around 55 mph since the beginning. They seem to be wearing down a little faster than BFG (sidebar- I’m very hard on tires).
If a smooth ride is your priority, take a look at D rated 35’s. Less common, but plenty of load capacity for a PW.