Thomas, the thing I did with mine was line them with Reflectix, since I was trying to insulate as much of the trailer as I could. I used one of those 3M spray adhesives to stick the reflectix to the fiberglass, and then used that wide silvery HVAC tape in the places where two pieces of insulation bumped into each other, to create a smooth easy-to-wipe surface.
Since I have a brown/turquoise/silver color scheme I decided the Reflectix fit right in, lol. But contact paper would stick to it if I ever wanted to change the appearance. Not super easy to make contact paper go around those compound curves, though, so I'm pretty sure it's all going to stay quilted silver.