CLOCKWISE FROM ABOVE LEFT: Rainbow Bob's pickup can haul a goodly load of lowcost ""boats"", purchased from area truck stops, tire dealers, farm co-ops, and service stations .... The ""Superstar"" rope seat boosts the Bowlings' profits .... Sure looks like fun, but a life preserver seems to be called for here (the entrepreneurs plan to offer such safety features this summer) .... Ah, just floatin' along!