towing a tender
I've had good luck towing my 11' inflatable tender at speeds of up to about 20 knots in 2 to 3' seas, but it really seams to be happier at about 17 knots. I usually leave the engine down just far enough to provide steering stability, and the only time I towed with it all the way down, the engine got flooded internally with sea water that got forced up through the salt water cooling system and entered the engine through an exhaust valve that was open. The engine got hydro locked which I cured by removing the spark plugs and turning it over. The engine also required a couple of oil changes as the sump was full of water as well. Fortunately it's been running fine ever since.