There are at least two ways the jaguars can "trip" out, or stop trying to send as much current as the motor can use. The first and most prominent one has already been explained. The jags will also reset if the voltage to them goes below a certain level. Voltage can drop due to excessive current being drawn from a mostly-discharged battery. It seems probable to me that a few frustrating runs with the described mechanical setup might have depleted the battery being used on their test. This would further complicate their problem diagnosis.
BTW I too want to see those 20" wheels, as they must be overlapped somehow AND the bumper placement must be something to behold for a frame that can support such wheels. Take some pictures. If you're not sure how to post them, mail to me and I'll put them up for you.
