What I Do...
...I have towed one for years. I use two 15' 5/16's dock lines with S/S snap hooks on the end and two water-ski floats attached. I tow it attached to each stern cleat. and with both clips attached to the bow eye. These are for towing only, the painter is attached seperately. Works great and I can adjust it from side to side or by length to ride the stern wave. Only once in 10' following seas did I need to let out about 30' of line. In that case, I just attached the line to the eyes of the bridle. The water-ski floats are to keep the lines from floating under the stern at low speeds and fouling the prop, altho I always pull it in tight when backing or in close quarters. I keep the dink in the slip, in the front. When backing out, I just attach the tow lines to the bow cleat, and tow the dink out in reverse until I get to the fairway where I walk it back. When I come in to the slip, I bring the dink up to the bow and reverse the process. Rick D. (This is the same routine some charter boats train. Rick D.)