The above advice is very good. Always check with the experts. In the past tax law has been that if your state charges income tax, that is deductible on your federal return. Somehow the large purchases get factored into the state return. Those states not charging income tax have a formula for deducting sales tax and then you can deduct major purchases like automobiles and RV's in addition to the formula. I don't know about 2012. Going to the accountant next week.
2013 Columbus 365 RL
2009 Ford F350 Super Duty Dually