New guy in OR, and an easy question...

Buying a 2005 gator TH 6x4 gas model with no bells or whistles. around 800 hrs on it. Going to use it to move heavy junk around a 20 acre property in places I don't want to sink my pickup. Near Portland Oregon.

Now for the easy question. What does the TH on the side of the bed stand for? I can't find the answer on google and our lovely forum doesn't have TH excepted from the <4 letter word delete from search setting.

Thanks guys!