Wow! Thanks for all the responses! You have certainly given us a lot to think about and check out. Just to clarify a few things and answer some questions that have been asked, yes, we have been in the motor home and checked it out. There are mice droppings everywhere and at one point, a raccoon had gotten in and tore out the back of the sofa to make a bed. My husband and a friend of his went over and took out 16 construction size garbage bags of stuff out, cut up the sofa and removed it and put out rodent repellent. The roof was resealed a few years ago and there are a few water spots around the antenna and skylight but it was 14 degrees out the day they were there so they couldn't really check out a whole lot. The thought on that day was to just clear it out.They were masked and gloved. It is about 4 hours from our home,where we need to get it to work on it and we have until August to move it. We have met with a truck repair company that is about 10 minutes from the campground and we will be getting the tires put on there for sure. They charge $125 per hour to put the tires on onsite but think that we may be able to get it to the shop after putting on the one tire that has come off the rim. We are working with a truck mechanic friend to replace the fuel pump and are considering cutting an access in the floor so that we don't have to drop the tank to do it. It is a gas engine. But after reading your comments, we may just go ahead and drop the tank anyway so that we can get it cleaned.
The remodeling that we are going to do is just your basic removing the sofa (it's already gone) the booth area and the extra chair and replacing them with custom pieces that we build, painting and new flooring. My husband is thankfully, a wonderful woodworker and is very skilled in all areas of home remodeling so we are not worried about the inside remodel at all. He was raised in a camping family and has been around campers and rv's his whole life although this will be our first. We realize that this is going to be a BIG endeavor but believe that we are up to the challenge. We are just waiting for the weather to break and the $$$ to add up so that we can begin the process as soon as that happens, hopefully in the next month or so. It only has 5500 miles on it and at this point I don't know if that is good or bad.
Thanks for all of your suggestions! We will be sure to review them and speak with professionals as well to proceed in the best possible way. What a great resource you all have been!