Has anyone built a bob-style push trailer to boost range and add some top end speed for a scooter? I'm planning on building one using a scooter hub-motor at 72V ($250 hub+tire, $250 controller, $260 Batteries + $ metal / $800 total). I'll put some pneumatic dampers at the hinge point to reduce sway and jacknifing.
I'll probably only use both motors for hills and maybe for a "turbo" feature.
Im going to fabricate the frame from 3/4" thin-walled steel with an aluminum battery box
1. Anything to be aware of, common problems?
2. Will having the trailer batteries run in parallel with the scooters cause any problems (the scooter is also at 72V). I'm bank charging the batteries at the moment but I'm planning to switch to the string charge + 2A soleil finish charge method. This would allow me to mount the 72V charger in the bike frame and just plug into any socket to charge (both the bike and trailer).
3. Any other advice?