Gary S.
Your key fob issue will require you to get a hold of the alarm manual, the door unlocking is all part of that system. At least it is on my 94. I am sure your converter probably installed some kind of automotive alarm system, and they usually need to have the key fob programmed to match the coach, especially if the battery has died, then it loses it's "mind".

We have a TrekMate alarm, if you happen to have the same I can forward a copy of the manual, but I bet yours is different, since you are quite a bit newer.