... Like I was saying before.... you just need to somehow make the toboggans bouyant and as long as you don't have any big waves, it should be fine. If you can get the thing to pretty much float, you shouldn't have a problem having the "rider" holding the tow rope as long as you start off reasonably slow and build momentum. I would think having the rider hold the rope would be safer only because they can let go in case of immenent death. Steering this thing seems like a long shot. My suggestion would 100% be to get this bad larry to float somehow. If not, at the first sign of any hiccups (which there is about a 100% chance of that happeneing within the first 12 seconds), the thing will simply sink right to the bottom... and you've done all sorts of work in order to achieve 12 seconds of fail and a pile of trash at the bottom of the ocean. How about sealing up a couple 1/2 bbl sankes... attaching them to the bottom of the couch itself... and making sure that the toboggans are a good 6 inches lower than the bottom of the kegs? The couch would float like a pontoon boat and when you started pulling, it should slowly come up on a plane. If there was a problem, the thing would just stop and float.
