I've read this entire thread - you are all over the map on this. It seems like you want a bigger RV so you wan't feel cramped as compared to your apartment, yet, you are hesitent to aquire the proper tow vechile for it. Not sure what amount of time you plan on being inside it for work purposes, I would hope that part of your plan was to get out and experience the different parts of the country you find yourself in. I'd say that would be how you spend most of your time.
Your putting in to much worry about how you are going to sell the whole thing when you are done. A lot of things can change in a years time - you might decide to keep it. Who cares how much it will be worth? Any loss you take will be well worth the expereince won't it? If you don't think so, then maybe you should plan on the hotel thing with rooms overlooking parking lots. Don't buy a 5th wheel just to get more space - get something mid sized. Or do what others have suggested and rent for a while. Consider carrying a bicycle or kayak as well.
Here is a link that has other links to information such as RV rentals and planning resources. I have a feeling you will enjoy your trip and become an addict just like the rest of the people on this site. Good luck in your future plans!