[LoBelly]

Well, I didn't put any type of gasket between the body and chassis of my RMC and I can't hear any squeaks at all when my car is running.

However, if I were doing it over again it is something I would consider.

Like the others I found a degree of inconsistency in gap/fit through various parts of the body and ended up using large washers and tightening the down the bolts over time to get a firm fit (certainly heard a few creaks then)

Good luck with your build

LoBelly