Camper Rehab

If you have the where-with-all to do it in aluminum like sabconsulting, that would be my recommendation. Part of the problem with damaged roofs, is that the internals need to be exposed and looked at before much of a decision is made, so you can see the extent of the structural repairs required, then formulate a plan.
Good Luck on your endeavors. Campers are not hard to work on, they just take time, effort and sticktoitiveness!

Garry