[berghild]

I NEVER run the refer on propane while towing.
Driving from AZ to San Carlos Mexico we ran a longer day than usual so i ran the refer off the house batteries. It was too long of a day and it dragged them down quite a bit. Usually I just leave it off while towing or on the batteries if a short trip....they hold pretty well. I guess it was because it was such a long day (for us, we never go more than 4 hours or so)
Now I know that it won't charge the batteries as fast as I am dragging them down. it is a big refer...but thanks for telling me the location just in case I ever need to replace it.
Oops, I just remembered we forgot to turn off the freezer that is in the storage compartment during that trip down....there's a bog part of the problem...that and all the phantom loads that we think we have off and we didn't.