Love the Firestone 5000s - I've had them on 2 trucks and never felt a need to control them from inside. If they were a primary suspension system I could see it but just being a supplement I've never felt the need to change on the fly.... or really ever for that matter (other than filling them each time I hookup which takes about 2 minutes). I just figure what's about right with some trial and error with each trailer or load and I'm set. I usually run them around 40 with my 11,000# 5th wheel. I don't totally need them but it just helps lessen bouncing over uneven roads.