I know there have been other threads on towable tubes but most people have larger boats than I do. I have a Larson 15' Bowrider with a 50HP Mariner. I am currently towing a 60" tube using the tow points on the back of the boat. It works well, but the teenagers I am towing don't like the round tube with the hole in it and want to be able to lie flat or kneel. Can you recommend a 2 person towable that doesn't abuse the rider, can be somewhat steered and works well without a tower pulling it, i.e. doesn't submerge and doesn't cause a ton of spray because of a low pulling rope? Thanks. I have heard people recommend the big mable or the chariot war bird II which looks to me like it would be fun. But, I don't think you can lie down on either of these, and if you can't are they still worth it over the ones you can lie down on?