it's not enclosed, just an open square top cargo trailer. it would only be submerged either 6 or 8 times. me and some friends are going to the beach and want to bring all of our jetskis, but only one vehicle. we figured we could do it if we could put some mounts on my cargo trailer and just use it. (redneck, i know.....but that's just how we do it) i didn't think about the electric brakes, but then again, that's why i posted something on here to get some extra opinions because i figured there would be things i wouldn't think about. glad i did!!