Give Bryan Nelson a call at Three Rivers Marine. He has a 16 ft SuperVee and tows it with his Ranger (may also give you some boat advice). BUT, he has the 4.0L V6 4X4.

I have the 3.0 liter V6 4X4 Ranger and consider it pretty guttless. I tow a small skiff/trailer around for work just fine, but a sled probably weighs 5X that. I'm not sure I'd like to tow a sled with my dinky V6.