M_Boats: towing

While the subject of towing is fresh in people’s minds, I weighed my M17 with full electrical package, Pacific trailer, 5 HP Honda with full fuel tank, sails, running rigging, etc., and it came out at 2950 pounds. Filled with reasonable personal gear for a boat this size, I would guess less than 3500 tow weight. My question: what is the lightest and most fuel efficient vehicle (with 3500 lb or better tow rating) that would pull an M17 without white knuckles and serious slowing on hills? I am using my ¾ ton 4x4 truck at present, but it is vast overkill, and a real gas guzzler. Thanks, Tom Jenkins M17 Scintilla