figure out some way to duplicate the exact interior space of this box. Then have her set up the inside in ways she intends to place her bed and bedding arrangements, storage for what she would realistic want to take along and then with her needs, for what ever trip and time intended. I don't need to know or care to know, her age or mobility at this age of her retirement, but is she intending to sleep on the floor ? keeping in mind of all of the physical requirements for even a small trailer, it's still a trailer, with all of the equipment it might need, chalks, spare tire, lug bolt wrench,jack road side flares or reflectors, i would put the minimum anti sway on, if for nothing else, forced to drive in a rain on a slick black top road. What is the insulation R raiting. Air circulation ?