The model that fits depends on the space available, and that is floor plan dependent. Height and depth are critical, of course, but you also need to measure to be sure the door(s) can swing open enough for access and that the inside drawers can be opened, and that a bottom freezer can roll out (French door and bottom freezer models).
Cabinet depth fridges are shallower and may be a better depth for RV use, but they are also wider. French door models have narrower doors, but the bottom freezer needs a lot of room in front to open fully.
You also need to figure out how to get the new fridge into the RV. Even with fridge doors removed it may not fit through the entry door. May have to remove a window or sometimes even the windshield. However, a friend of mine got an 18 cu ft Whirlpool into his 2004 HR Endeavor through the door. Tight, but he managed!
As the man said: Measure, measure, and measure again!
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL