Mods:
Cupboard, and shelf above the bathroom sink
Shower, (drain? hot water heater?)
Rear jacks
Wood below rear window
Shelf on dinette side of closet
AC outlet beside
furnace, and by the door on the bathroom bulkhead.
Florescent
light above sink, and dinette (120 VAC?)
Bathroom bench is not original
Hand pump missing on sink, (water tank?)
No bathroom door
Tongue jack
Coupler
Just based on the
fridge, and the fact that the window in the door doesn't open, I would speculate that this is a 1979, or later.
The hammer is probably for the coupler. I have a similar one on my first 4500. It is kinda sticky.