I've been thinking again about TZ85As in a heavy and was wondering if there was a way of hacking the esc so it acts just as a simple PWM controller (no reverse) so all the Mosfets are being used at once, you could then use a separate H-bridge using automotive relays to deal with the reversing/braking and the TZs are just altering the speed. It would be similar to a 4qd controller but replacing the MOsfets bank with a tz85a. I'm not an electronics engineer so don't know if this would work in reality or if it offered any benefit over just using a tz85a by itself but it sounded like a good idea to me!