I have several 900 20 tubes because that is the size my truck uses. Fill them up maybe 4-6 PSI put a circular piece of plywood on one side bound with some heavy string or just lay in the middle if the cold water does not bother you. I floated from lake arrowhead past the springs, but it is quite a bit of work getting on and off as you encounter large boulders that make passing through difficult. Wrap your items in plastic that you do not want to get wet. But yes it is doable.