I use them on my 1 ton 04 dodge deisel and I swear by them, I tow a 24 foot haulmark and before I would have people flash there lights at me at nite, not anymore, and I have the equalizer hitch also. I put the camper on now and put 50 or 60 psi and truck and trailer are level as can be. When not towing or campering 10 or 15 psi is plenty as it can be very stiff, Tim