Yes, as long as it contains sleeping, kitchen, and bathroom facilities, you can claim it as a second home in the Your Home area of Deductions and Credits.  You can deduct the interest on the loan, real estate taxes on the land it's on (if you own the land), and personal property taxes paid that are based on the Value of the camper. (see below)

Here is how to enter your home information:

• Click on Federal in the left column 
• Click on Deductions and Credits at the top of the screen
• Select All Tax Breaks so that you can see all your Deductions and Credits
• From here you should see Your Home