I know there are many threads about the merits of air bags and other suspension mods on 1/2 ton trucks. I just got my camper on my F-250 and am noticing a tiny bit of sag in the back. Have any of you with 3/4 ton trucks noticed that when your camper when on? Has anybody still used air bags even on a 3/4 ton? Not sure the slight sag matters. I had assumed air bags would only be for a 1/2 ton. Thanks.