Ken, Welcome to the forum. One can deuct the interest (only) paid on a second home. It is considered a secondary domicile, your permanent residence is your primary domicile. A residence with a kitchen and bathroom is considered a domicile whether it floats, rolls or is glued to terra firma. Translated, you can deduct the interest on a boat, RV or cabin. In reality, this equates to zero (0) percent interest on the loan regardless of what the bank rate is. These loans can be gotten for up to 20 years. You can only have 2 domiciles without getting exotic on your taxes. The interest on the Ford 650 is out. However, you can deuct the cost of registration (tags) from your federal taxes. 'IF' you had purchased an RV in 2009 you could have deducted the taxes, it was part of the economic stimulus package that Congress signed into law. Ken, the 650 is a nice TV... but smaller less costly units work fine also and are more economical to operate. I just bought a BH 6780RL it weighs 12,200 empty and 16,000 max load. I pulled it home from the dealer (empty) with a 2500HD (3/4 ton) which has a 8.1L (502 cu in) gas engine, Alison 5 speed and it handled fine. However, I purchased a 3500HD (1 ton) Diesel, Alison 6 speed just to give me a cushion when Patti & I put all our "Stuff" into the RV. Ford, Chevy & Dodge 1 tons cost about $ 50,000 + to buy & set up to pull a 5th wheel. They also can be used for that side business you are going to start. Then 'ALL' the cost can be deducted from your LLC taxes. Some who have the Tim Allen complex (more power) will swear I am wrong, thay just gotta pull into camp driving a behemouth that has stairs or ladders going up to the cab. In the end it's your choice, but I suggest you and your accountant sit down before you sign on the bottom line and make the choice that's best for you and your family. When it comes to technical questions many experienced members on this forum will help you, thay are a wealth of knowledge and they are glad to help - just ask, again welcome.