Didn't closely study the water heater (Suburban SW6D) before hitting the road for the first time (2015 Rockwood Premier). Oops. Now reading the first steps in turning it on, which are to turn off the electric and gas to the unit. How? I guess the interior switch near the unit (and the air heater) will do the former. If all else fails, turning off the propane tanks would eventually clear the gas from the unit - but I'd much rather do it closer to the unit itself.