Our 64 Safari has an exhaust pipe.
I installed Hydronic heating by Precision Temp, TwinTemp JR. 55,000 BTU propane burner and 1,500 watt electric AC element and three heat exchangers. Space heating plus instant and continuous hot water. We spent the spring in 22 degree weather and were comfy and cozy inside. Plus all the hot water the wife could use. It only takes up about the same space inside as the 6-gal water heater did. It is considerably quieter & more efficient than a blast furnace that cooks the air and make your hair stand on end. No kidding this has been the best single investment I have made to the retro fit of our rig. I would recommend it to anyone who is looking to upgrade.