The pimpest version of jetsled I've seen on here was by
@seuss79 in this thread. It included wheels and a bicycle!
That said, I have the runner kit on mine. It came with rubber gaskets/washers to try and limit the water intake, but I've never had it in water really, so can't say that it is water tight or not. But it GREATLY reduces wear. If I had to do it over again, I probably would have changed a bit where I put it. I could really use some additional protection for getting it in the back of the jeep. On the back it gets a lot of wear, when it's getting lifted into the back. I've thought about adding some carpet or looking for additional strip of polyethylene without having to buy an entire kit.