Kayaking down rivers is definitely a fun experience, with new scenery constantly presenting itself at every turn. It does offer one logistical challenge, though you have to leave one vehicle at your take-out point before you start, then take another vehicle (with your kayak on it) upriver to the put-in. That, or you have to arrange for someone to pick you up. Either way, it's not a one-person activity. Ohio-based inventor Jerry Allen, however, has created a possible solution. His Solo Shuttle Trailer lets you tow your kayak behind your bicycle to get to the put-in, then bring your bike along for the trip to the take-out