I run mine like most the folks here around 30 - 40 psi, i experimented from lakeview ohio all the way back to Enterprise Al and found that 50+ all the way up to 80psi started giving me chucking and more than normal bounce, i have the guages and switches, compressor and tank and it was money well spend, took about 2 hours to install everything after spending a day to decide where it all would go. I put the compressor and tank in the space above the spare tire and they fit great, i also put in a relay to power the compressor and ran the signal wire from the pressure switch up under the hood to keep it all protected.
using the bags when i park i inflate up to about 80psi in a flash then drop the front feet get her level and deflate to unhook, with the ranch hitch and b&w ball it is a snap and very fasy no levers and no messing with anything.
the guage and compressor are worth it, especially for filling tires, and inflatable toys!!