Not only is the rear window a "is it there or isn't it" feature, apparently the type of fridge is as well.
In the pictures above for the one in Tucson there is no venting for the Refer indicating a compressor fridge. Here is a Vegas in Maryland that has venting for the fridge...absorption fridge on this guy:
https://www.leosrv.com/product/new-2...w-website-link
The specs also indicate a 6-gal water heater...going back to a tank water heater I see.