On Jan 12, 7:05*pm, bildan wrote:
*On downhill grades, the wheel motors would
switch to regenerative braking to recharge the trailer battery and
save the towing vehicle's brakes.

Is that actually the case? I was under the impression
that the electrolyte will boil if you try to put energy into
batteries as fast as it can be taken out.

I'm more than happy to be corrected, if necessary.