Originally Posted by yelhelp
I do not feel we are over loaded.
Originally Posted by dcheatwood
Sounded like you are bottoming out.
^ This. If you are and are not overloaded...airbags.
Of course, your hitch setup itself could actually be causing it (wrong size spring bars, for example). Too heavy a bar would more or less fuse the two frames together and not allow for any flex at the hitch.
Shocks: don't know what year truck you have, but suspensions do wear out over time (specifically leaf springs...and you won't notice it unless you have a lot of weight on it ). All the shocks in the world won't help that. My father in law borrowed our popup last year and it nearly bottomed out his Mountaineer. He couldn't understand it because he just had new shocks put in.