I do this all the time. If I can help, send me a personal message or email to earth at kingston dot net

But in short if you download a free-of-duty-manifest from the US Border Protection website (it's an editable pdf), and fill it out, the border guys will love you. But if the declared value is over US$2,000 you need a broker. Broker will cost $75 and up. Fedex and UPS will screw you. Try Livinston.

The others are right - DON'T have mud on it or else they can send you back to have it cleaned. Does not have to be spotless, just no clods of farm dirt.

I haul too, so let me know what you are thinking if its in Ontario or Quebec.