My "Air Lift" Load Controller bags add 10# load capacity / PSIG Inflation / Bag; 5 psig min.; has built-in solid rubber overtravel stops. NOTE: This mounts directly between frame & axle tube housing, an appropriate setup, thus avoiding cantilevered brackets. With Std. Level II Load Controller (compressor & dash mounted single regulator control & pressure gauge) # 25592. Purchased mid 2009; I finally installed 6-12-2010.
My cousin [stubborn mule] had Timbrens & it rode like a Military 2.5T truck---almost quit RV'g---took me 2 years to convince him to ADD air bags & leave the Timbrens as a "emergency backup" equipment. He liked that idea!
I bought the inexpensive compressor & mounted it "temporarily" on floor behind my seat. Not in anyone's way, out of the weather & only 'noisy' 6 times a year when it's needed. Ride quality - well it's for load, not to soften bad roads and thusly gives the shocks a real work out, 'cause it does not damp the vertical travel. In other words it's 'bouncy'. I prefer having them rather than not.
After adding a .499" thick leaf to my secondary pack for load support some years prior, then installing [easy] the air bags, I now have come to the conclusion [learn too much too late] that a preferred engineering approach would have been to install [didn't know it existed before this] a new spring pack with 12 thin elipptical leaves. Yea, that would have been the ticket, but $1,000+ I did not have, and can no longer justify. Funny to think about it, but with air bags & my custom suspension leaf modification, I could probably haul 5,000# before showing any sag! LOL
Attention: TDR Forum Junkies 
