Talk to your RV dealer and tax folks about the class of TT you are considering. There can be a tax advantage to larger RVs. If an RV has permanently installed facilities, i.e. RV toilet, shower, and you spend at least 14 days a year in it, Uncle Sam will let you class it as a 2nd home in which case you can include any loan interest you pay on the TT as mortgage expense on your taxes.
This is slightly incorrect information. There is no test for "permanently installed facilities" and the only test that requires "spend at least 14 days a year in it" deals with a house that you rent out part of the year.
But, understand, I am not a tax professional, I don't even play one on TV. Take all advice you get
over the internet with a grain of salt.
Now, if we look at
IRS Publication 936 - Home Mortgage Interest Deduction you will find what qualifies.
It states: "For you to take a home mortgage interest deduction, your debt must be secured by a qualified home. This means your main home or your second home. A home includes a house, condominium, cooperative, mobile home, house trailer, boat, or similar property that has
sleeping, cooking, and toilet facilities." That is the test, it has to have all three.
As with many laws and regulations, there is no further definition of "sleeping, cooking, and toilet facilities". This is left up to you as to what you feel comfortable claiming, if audited what the IRS auditor believes and previous tax court rulings on this definition.
I do know that many folks with boats claim the second house deduction for boats with porta pottis.
The other key word is "secured". Again, from the IRS Publication 936 - Home Mortgage Interest Deduction the definition of secured debt is: "your mortgage is a secured debt if you put your home up as collateral to protect the interests of the lender. If you cannot pay the debt, your home can then serve as payment to the lender to satisfy (pay) the debt." So,
the pop up MUST be collateral for the loan and it must be at risk if you don't pay the loan.
Again, talk to your tax professional about this issue - don't just take my word for it!