Yep, boat trailers and vanity don't play well together :laugh:But really, squeaking is just part of the ride. Best cure is the volume knob on the radio
Badly worn bushings and rust build up on spring bolts is most likely your problem. You may or may not see the bushing condition depending on your leaf spring design. Remove one and you will be amazed what you see. Another spots to look at would be bolts x-members hang on if you have single bolt design for tilting there.This thing sounds like a wreck going down the road.