Anyone know of any places that make it so a bicycle can have a 'back' seat. It would come in handy to take people on rides. I'm guessing I could have a welder weld another seat on the back from a different bike, but has anyone here done this yet? I'm guessing would have to upgrade to some heavy spoked wheels to compensate for the extra weight (have to upgrade anyways because my wheel has gotten wobbly since a few spokes have bent from the mounted sproket.) -Chris PS: I'm a light guy (about 150) so extra weight wouldn't be TOO much of an issue.