It is apparent that our toy hauler has seen it's fair share of the sun. A good portion of the caulking has dried out and hardened, while other sections have shrunk and pulled away from what it was in...
It is possible that WD40 may leave an oily residue that could create a issue with the new caulk sticking. Would hate to have that after all the work that will be required to remove the old caulk.
Am going to start with the heat gun, plastic tools, and a remover made for the job.