Awelife RV Outdoor Shower Exterior Shower Box Kit for RV, Camper, Van, Travel Trailer, Motorhome and Boat, Black

Would you be able to install this on the utility side of a pup (pop-up camper)??

Can you turn the water flow completely off with the water saving switch on the shower head?

Can you connect a garden hose to it to supply water?

Is the door easy enough to remove? I don’t need to use the door as my trailer already has a door to close. Just need the inside parts.