rvrzal, I have a 78 ARGOSY Minuete, which access door blew off? The refrigerator vent door? If it is completely gone and you will be using the trailer, I would look at using sheet aluminum to remake an access door, but it should be vented but water-shedding. If you are done for the season maybe a piece of plywood cut to size and sealed in place would do? Is the hinge still there? I have a 10ft roll of thick plastic sheet I got from the hardware store. It is sturdy, and easy to shape/cut. Nascar guys use it for panel repairs during races, and I used it to reinforce/rebuild my plastic tub wheel wells. I hope this helps...