According to the 2005 Camelot owners manual you have an Essex keyless entry.
Programming is covered on page 184.
However, the early Essex keypads are notorious for dyeing when left in sunlight.
A1 Electric in Torrance CA has the new replacement model for Monaco coaches.
KE-1701BHC keypad has the original Monaco connector.
I installed the new model 5 years ago and it still works great. I was also able to program some Remocon key fobs to work with it.
Let me know if you need more assistance.