How to adjust 5th wheel height (bobtail)?

Is your leveling valve adjusted properly? Or functioning properly? Have it checked.

 

from my experience, i know prostars sit higher than other trucks, so it must be another prostar dropping the trailer, volvos have airbag dump i believe standard. and the tire size can affect this too, especially if his other company drivers are not running lopros and he is... or maybe its just someone out to get him. i think i have encountered more dropped too low and high. I would have your bags checked, and do prostars have leveling valves?

 

Find the arm that controls air/ride pop it off, by hand move it to make truck go up,after your locked in reconnect airride arm an it will lower sup. back like it was, some are easy to get off others are where you must get under truck and are not worth the trouble to get yourself run over by truck trying to do it?

 

I never enjoyed D&H's...too many drivers are too selfish and refuse to spend THEIR time getting repairs made to a trailer they are getting ready to drop and too lazy to write it up to be repaired while the trailer is at the yard. Never fails, I hook to a new-to-me trailer and I've got to spend 4-5 hours getting things fixed that nobody bothered to write up. I'd rather just keep the trailer I KNOW is in good shape and live load/unload.