Yes I think powering the front drum would more than solve the traction issue completely. It's just all about time and cost. How much does someone want to spend on a toy like this? Powering the front drum would require some big changes to the drum itself and the frame(at least in my mind). I'm not saying that it would be a bad idea but then this thing is going to cost a lot more. Maybe someone would pay $1500US for it but I don't know? We tried to do these at a lower cost so I have to stop somewhere and be satisfied with the results.
