When we bought our 1998 Excella 1000, the owners cautioned us about the deadbolt located above the door lock lever. If the deadbolt is extended even a little bit when closing the door, there is a possibility of having the deadbolt engage. Keys aren't the issue when this happens! On one occasion, they had to crawl through the rear storage compartment and lift the queen bed to access the inside (a job for a small person)! For door locking accidents, both of us have a trailer door key and we have a spare in the truck.
Two Hams in a Can, and Madison the Cocker Spaniel in our 1998 30 ft. Excella, Hensley Arrow Hitch, 2001 Red Silverado 2500HD Extended Cab, 8.1L Vortec, Allison Transmission