wet bolts and bronze bushings are IMHO a good upgrade if you put very many miles/year on the trailer. It will adress some suspension component weakness. I doubt it helps on keeping things from moving around one bit. I didn't notice any difference. What will help things from moving around is to get the tires balanced, if they are steel wheels make sure the shop uses lug centric adapters. If they are alloy wheels they are probably hub/lug centric. That made a noticeable difference in both my trailers and with several other friends we travel with.