I bought a travel trailer can I write it off in any way?

It can, if you itemize tax deductions.   There is no tax benefit if you take the standard deduction.  

You're allowed to deduct the interest on a loan secured by your main home (where you ordinarily live most of the time) and a second home.   

A mobile home, RV, house trailer, or houseboat that has sleeping, cooking, and toilet facilities counts as a main or second home, and as long as it meets all the other requirements for deducting mortgage interest, you can claim the interest like an immovable home.   From this TurboTax FAQ

Personal property taxes are deductible (as an itemized deduction) when they are based on the value of personal property, such as a boat or car.  To be deductible, the tax must be charged to you on a yearly basis, even if it is collected more than once a year or less than once a year.