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It might depend of motor? Do you think?
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That would be determined by the internal resistance (inherent with KV) of the motor.
The motor generates energy once the vehicle is running; some motors KV value are determined by spinning the rotor at X rpm to make 1V. Don't know if this AC is measured over 2 wires or if it's the sum of all three phases.
Basically every electric motor that uses magnets can be used as a generator. It produces energy once it spins. This is the reason why shortening the wires affect the turning resistance of the motor.
You said it yourself; if it spins faster, it has more resistance with the wires shortened.
If you have no batteries attached and you spin the wheels at 60-70mph and the truck is geared for 20mph i am pretty sure the controller will burn.
Perhaps even sooner, but the idea is obvious i guess.
schulze tells the world about the loose contact; he told me that a loose contact is worse on braking than on accelerating; this combined with the fact of his 'store the energy in the batteries' made sense to me.