I am planning to tow a 19ft tender to the Bahamas. In the past I have towed a 15ft Boston Whaler approximately 130-150ft back cruising at 24-25 knts. Obviously this boat weighs double the whaler 4000lbs and wondering if same distance back is about right. I tow the whaler with o/b engine slightly down in the water to keep it running straight. Also will need to upgrade size of line to 3/4 or 7/8" double braid. Any comments appreciated on towing the larger boat.