Amputatee Vet Needs A New RV to Live

My dad is a diabetic that has been fighting foot infections that have cost him all the toes on one foot and one toe on the other. The foot without toes is infected again and it's gotten into the bone above the ankle, they are going to amputate at the knee this Tuesday the 19th of September. Too top that off the used motor we put in his Rv has lost the bottom end. He's no longer going to be able to travel up and down the coast and will be moving into the park we stay at full time so we can care for him so he doesn't need a motorhome. We are looking to purchase him bumper pull travel trailer to live in. It will need to be newer with no leaks as well as everything in good working order. This will likely be his last house. On his social security he can't afford a whole lot. On top of that his medical bills for his portion are going to be outrageous. We're looking to spend between $5000 and $8000 for a decent Rv and then make any modifications to make it accessible for him with his medical conditions and the loss of one leg.