First off, look inside all of the wardrobe doors and see if there isn't an equipment list with the make and model of all the appliances. My Winnebago, Thor and Bigfoot all had equipment lists glued inside the wardrobe door.
The fridge ID is probably just inside the door, and the water heater ID also will be just inside the outer door. The stove requires removing the top, most of them you push back real hard and disengage the spring clips in the back and slide the top forward to get it off. The furnace will require removing the outside access to find the ID plate and the A/C will require removing the air inlet/outlet (assuming it does not have a ducted system). Its an Easter egg hunt to find all of the ID plates but very necessary to get the right manuals. In addition to basic install and operation manuals, usually 6 to 10 pages, there are service manuals which will be handy such as the
Atwood water heater service manual.
Charles