It's understandable that you have a lot of questions. Try breaking them up into different posts for each subject area once you have done some more research. I can tell you that if you have difficulty affording your apartment it will be very difficult for you to afford a motorhome. My HR was in great condition when I bought it but I have already had to put as much into it as I paid for it after only 5 years. You are probably going to pay at least 15K for a (newer) older unit with a slide. Is that in your price range?
I do wish you good luck on your new endeavor.
Miles