We did the same thing with our fridge, leveled the fridge inside, and then added stick-on levels to the outside front and one side, set so that the fridge level was considered to be trailer level. That way, we could set up the trailer so that the fridge was level without having to open the fridge door and take out the food. This works great, and the trailer itself is only barely off level. Since the kitchen counter is also slightly off level compared to the trailer floor, the variation really doesn't matter much. Our original 1974 fridge still runs great on both propane
and electricity, and small variations in level at different campsites have not affected it's effectiveness. I was surprised when we bought the trailer last year how well it worked.
As an aside, we have had two little trips this summer in the trailer so far, and the new axle
(from Paul Neumeister) and the door-curve fix have both worked great. Our friends recently noticed a 1980 17foot Boler for sale
in a field in northen Alberta, and bought it for $2800. It has everything working and needed only a (relatively) mild cleaning, so I am insanely jealous at the extra space. We still like our little guy and it will be nice to have company on our trips.
Rick G in Edmonton