i just bought a 1968. I've got some question on subfloors if you have any experience. thanks so much. sorry i can't help with furance question. mine has an after market dsi unit. it heats up real nice
been doing a lot of work to ours though. we bought it in idaho and towed it back to southern califorina with our new born, it was an epic trip.
sanded, primed and painted rear bumper and hitch! re sealed and deep cleaned and painted and got all new hoses for the original hydraulic jacks (although one of the mounts in broken so ill have to try and find one somewhere our there) got a new toilet and gutted the rear bedroom. my wife is being such a patient beautiful supporter.
we are full time living in ours
)))) raising babies in travel trailers