</font><font color="blue" class="small">( I do not want to get introuble trying to evade a tax. )</font>
Joe, you said the magic word . . . evade. Anyone trying to avoid taxes should consult their accountant. Anyone trying to evade taxes should consult a good lawyer.
Be careful about buying across state lines in hopes of saving sales tax. You would still be liable for the sales tax in your home state. Many dealers will tell you that you can buy TAX FREE if they ship the tractor into your state. That is a 1/2 truth, you don't have to pay THEIR state tax, but you still owe YOUR state tax. If you finance the tractor it is very likely that you'd be getting an unexpected tax bill about a year or two after you take delivery of your tractor. If you don't finance, then you might get lucky. But in any case you'd be breaking the law.
Some states do not have sales tax, those states are not an issue! Some states have agricultural exclusions, if the tactor and user meet the criteria, then the tax is waved. But anyone crossing lines for the sole purpose of not paying the tax is very likely in violation of their state 'use' tax law, subject to payment, penalty and prosecution.
DISCLAIMER: I am not an accountant, financial planner or tax planner, however am regularly called as an expert witness in the midwest states to tesitfy on excise taxes, cross border tax evasion and similar topics. I've testified in several states on behalf of various organizations, and at the request of legistators. I've also been deposed as an expert witness in federal court trials for multinational corporations on related topics.