I have loaded my tractor onto as little as 12' trailer by putting the loader over the front and the tailwheel of the mower only hangs out the back a little. A 16' trailer should be enough. I know a lot of people will not haul an 18' with a 1/2 ton truck. I'm not really sure if one should, but I know some that do. I had no problems with the 12' trailer, but it was my brother's and when I buy one, I'll go for 16' until I can afford a larger pickup. John