If your camper has the old style aluminum siding on a wooden frame, you can remove it from the lower end upwards. The siding consists of about 1' wide strips running the length of the camper, stapled to the frame. Remove trim and sealant, pull staples, remove siding. You can not remove strips in between.
If your camper has an aluminum frame, composite walls, or any other "more modern" design, things will be different.
Search the Truck Camper University for "rot repair" to get an idea what other folks have done.
You may have just overstressed the mount ... or there may be a structural issue behind :-(
Good luck with the repair,
Joerg
