$1500 tow vehicle advice? - don't laugh.

It's almost exactly 1 mile from my driveway to the ramp. Odd as it sounds, I haven't owned a truck in the 8 years I've owned a boat. Always had enough people close by with trucks that I have never had to worry. This year, though, it's already become an issue. With gas prices the way that they are, less and less people are daily driving big trucks. So... My budget is $1500 but it seems reasonable given that I will be in it for less than 150 miles per year. Here are my criteria:

- 4x4 (would be nice to be able to drive it the 1 or 2 days a year that it snows more than my car can handle.)
- Don't want to constantly wrench on it.
- Needs to be regular cab long box or short-box, extended cab. Driveway is tight and need a shorter wheelbase to manuever.
- 3/4 ton/1ton would be nice.... but not totally required?

Boat is an 87 Supra Saltare. ~6500lbs with a full tank of gas and trailer. About at the limit of an older 1/2ton truck.

There are plenty of Chevy, Fords and Dodges available in that price range but all have 175k+ miles. Any of them going to be more reliable than the others for that mileage range or is just going to be a roll of the dice? LOADS of suburbans available. A few expeditions w/ the 5.4L. Just wondering if anyone has info on things to for sure stay away from or advice on engines that are bulletproof over 200k miles.