Condensation in Metal Trailer Roof?

We have a dreadful problem with condensation in our trailer roof. We have pulled down the ceiling, removed the insulation, and cleaned it up. We need to know now, how to fix it the right way. I am wondering if creating a "transition" (air pocket) like the one that exists in a wood attic, ie. "drop ceiling" like situation to create a larger air transition area would work.

Insulate right on top of that lowered ceiling. Rubber the inside, underside of the metal roof, to ensure against leaks, and top inhibit further condensation, as metal is a better temperature conduit than rubber. Will this work? We need to save this old trailer, on a budget.

By Betty