Does anyone have experience with the 8' Walker Bay, Rigid Inflatable Dingy Tube Kit? These are the inflatable tubes that mount along side the outter edges of the dingy. - Do they work as advertised and proivde stability? - Are they durable and worth the money? - How are they fastened to the dingy? - Where is the best place to buy them? I have the dingy but it is tippy and scary getting in and out. Living around coral, I prefer to keep the hard bottom dink. Any help or suggestions would be great. Thanks, Okiman