I pull a masonry trailer that has the scaffold up in the front (approx 5-700 lbs of tongue weight) I just had Timbrens installed today, and I also have a weight distribution hitch, when I hook the trailer on it only sinks down a few inches but it engages the overload springs and then they ride on the rubber stops on the frame and squeak like crazy...With this set-up should the overloads be engaged at that point. The squeak is annoying. The trailer is a tandem axle 14 footer by 6.5 wide, I would consider it medium duty. I guess I'm wondering if my leafs are shot or if this is normal? Does anybody know the official name of those rubber half-moon things that are attached to the frame via three bolts. Their are two on each side. If anybody has theirs off the truck and wants to sell them let me know, as mine are wore down--the salvage yard will not sell them to me. Thanx.