I had that same problem with our 76 Argosy, repair or replace. So we purchased all new replacement appliances. Furnace, fridge, water heater and stove. The first thing that I realized was they all require a new 12 volt
line for the electronic ignition. No more lying on the floor trying to light the furnace pilot, but another project added to the list of things to do. That led to replacing the old unitvolt, new wiring, new cover plate to resize the cutout for the water heater and revamping the plumping. We are glad to have the convenience of the new appliances, they all work great. Just wasn't expecting the amount of work involved to add them to the existing trailer.