If you have rust on the frame, check the underside of the trailer. I've had to replace just about every bolt on mine that attaches things like the main gas line, supports for the tank dump handle guides, step attachment bolts, etc. I don't know if they got a bad batch of self tapping bolts, but just about every one has broken. Even the ground bolt for the black and gray tank sensors!
2012 Jayflight 28 BHS
2014 F150, 5.0 L, 3.55 axle