Ford SuperDuty more bumpy + jittery empty, than when loaded?

If the tire pressure is near max, it will definitely ride worse. The exception is 19.5s that don’t ever get that soft because most recommend you never go below 70. With regular E rated tires, you could easily drop to 50-55 unloaded instead of the max 80. Even on 19.5s with a SRW, going from 110 down to 70 will help some. You may have to run more than 50 on the front if it’s a diesel.

On my DRW with 19.5s, I never bother to change my pressure since I run with camper at 75 and I can only air down to 70.