3/4 ton pick-up will limit your choices. A JD 450 or a D3 are going to be in the #14000lbs range, add a trailer and your outside of what I would think a 3/4 ton could tow. JD or Case 350's, JD 400 would be ideal, but since they stopped making that size the used units have increased allot. Also when you jump from a 350 to a 450 the undercarriage parts increase in cost allot. D-21 is a good choice, but some grey market machines can be hard to get parts for. I had for a few years a Dresser, that was a very good machine, but larger than what you are looking for.