When Sportsmobile builds a class b motorhome, dc/ac fridges come standard in the pricing. Propane is an option. Sportsmobile tends to build for people who want to get off the beaten track. Often times parking at trailheads is not level. Dc (compressor style) fridges will work at angles up to 30% . Propane fridges will not opperate too far off level. This matters if you go on an all day or overnight hike. Many SMB 'S Have no propane at all,utilizing big batteries,solar,power,inverters to run hot water heaters, microwaves etc... They were making all electric campers long before Roadtrek got in the act. They also use flatplate waterheaters and other devices.