I gutted it, insulated and lined it, installed a laminate wood floor, new counter, new stove, had it re-wired. Installed flip switches inside the door for overhead and outside "porch" lights. Carpeted and wallpapered porta-potty closet. Made new cupboard doors with aluminum screen. And my favorite thing, put bamboo floor mats on ceiling which were the perfect width. Cost: seven bucks
Exterior
Fiberglass repaired and painted. New amber "porch" light installed. New awning rail, new awning, screen room, new battery, new spare tire, new wheeled hitch stand.