Okay, I'll try a higher PSI next time I haul. I've long since lost the instructions, and didn't want to put too much PSI in the bags for fear of rupturing them.I’d suggest bump up the psi a little at a time when loaded.
Maybe start at 25 then go from there, until your satisfied.
My car hauler had about the same tongue weight I ran about 50 psi.
I’m looking for ride stability better front steering control over being level.
No less than 5psi is recommended when empty not only for the rides sake, so if 7-8 is good for you, then stay at those settings.
For anyone questioning the minimum, it’s because air has moisture which will help bags longevity, less chance of them cracking inside out.
I’ve mentioned this before, I have the AirLift Load Controller II which has a 5 psi solenoid in-line so it will always maintain no lower than 5psi.
Unless a leak shows up, then the air pump will just continually run until you pull the fuse, then fix the leak.
I know if there's 15 PSI in while the truck is empty, the ride is harder.
I always figured the minimum PSI was to keep the bags from pinching between the coils.