Ditto on seeking help from a tax accountant ...
As I just posted in another thread related to tax info. I've learned that some strange rules apply. One such rule pertains to how differently trucks above a certain GVW are handled with regard to writeoffs. This may not apply to you, but my point is that those who deal with these matters daily are equipped to help you the best.
An hour's worth of time, even at $75 or $100, may save you much money, and help you determine what direction to take for some decisions. Obviously, some decisions have nothing to do with taxes, but others may have some significant bearing.
I'm happy to keep every penny I'm entitled!