I'm sorry. Pushers drive an already inherently risky sport into the (for me) unacceptable level of risk category.
By the way, I'm an adrenaline junkie.
Look at the mechanics and the physics of the pusher power source. An essentially unregulated flexible joint between the power source and the control mechanisms of the vehicle, and think about what can happen if, say, the throttle cable gets pinched at WOT and the pusher runs away from you. Or you are cornering, hit a bump/pothole and twist the throttle inadvertently, and the pusher shoves your bike sideways out from under you.
Not too mention the countless other accidents that bikes are prone to, virtually all of which are made worse when you add a heavy trailer shoving your hide across the pavement as you struggle to stop.
Look at the design of articulated vehicles where the power source is behind the operators controls - they are virtually all hydraulically or mechanically (or both) damped and limited in the degree of flex to a very limited range. There are excellent reasons for that fact.
