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Just read other peoples threads...... the info you are going to receive is that it works but obviously not as good as a banshee bungee and it wont last as long. also, it wont be safe/
http://www.google.com has an answer to every question
found this on a snowboarding forum that should help
Go to the army surplus store and ask them if they have the repelling bungee's. Take 3 long strands of it and tri braid it and then connect it with a handle, about 3/4ths the way up from the end that anchors have an off shoot of a double braided bungee that ends in another handle that way you can have 2 people pulling. At the end that anchors find a way to attach a caribeaner or something to lock it into whatever is pulling you. It's actually a real simple concept if you just look at it and shouldn't have an issue making it. google_ad_section_end
i dont see how in the hell you would do it with bike tubes, but the above post sounds promising