Make, model, year, and what type of RV? Trailer, 5er, MH, Pop-up? Where's the damage, front, rear, drivers side, passenger side. Not enough info.
As with any damaged vehicle, the only thing you can do is start disassembling the damaged area until you reach undamaged area. Replace the damage with new or good used and hope it all goes back together again.
If your camper is aluminum skinned with wood framed walls, you'll just have to rebuild the damage, much like you'd rebuild a wall in a house. But, without more details, it's hard to give any suggestions.
