I do have a WDH. It does help to level the truck and transfer the weight back on the front "axle". I use the WDH to put the truck back to normal ride height then add 15 psi to the air springs to minimize the bounce.
The tires on it now are E rated and are rated for a maximum of 80 psi. Today I ran 60 psi in the rear ones. Will another 20 psi significantly stiffen the side wall?
I see people towing bigger campers than mine with 1500s.
Heck yes ! 20 pounds more air pressure will make a big difference for the better in your truck tires. You should run your tires at max air pressure when towing on both the truck and trailer. Actually it's better to be over filled on the trailer tires by 10 PSI.
I think the front of the trailer needs to be lowered by a couple inches and add more tongue weight and I bet you will be good then without buying new tires.
A friction sway control is nice too and should be considered with a short WB truck.
