[jray3]

I have both a generator trailer and a pusher trailer (based on an aircooled VW). The pusher is great for long highway trips, but on sub-100 mile journeys where it would only serve to prevent one fast-charge session in my i-MiEV, it is on balance, impractical. Driving the pusher is fun- it turns the MiEV into a vehicle with some serious passing power on the highway, having doubled the power available! I'm working on refinements, as binary control (WOT vs lugging a dead engine at speeds under 30 mph and when stopping/starting) is inefficient and yeilds a a blended city/hwy mpg of only 20.
My genset trailer charges the Karmann Eclectric at 4 kW, which only extends highway range by about 15 minutes/15 miles, but it does enable continuous recharging while crawling through traffic or stopped somewhere that has no EV charging options...

An automatic-transmission Metro drivetrain could make a very good EV pusher, but I built with what I know best and had on hand.