Anything can technically be run off a spike. Just don't expect to run it at stall for long, or last very long. For the most part, you can run any motor off the spike except the Drill (any year) or the CIM. There's too big of a chance that you will most likely exceed 20A for a long period with these motors.
The FP and van door motors are questionable, but they should work. Just try not to stall the motors very often. The
FP motor draws 57A at stall and the van door (any year) is 40A. Basically, plan your motors to only use 20A of the stall current. The ratio of the usable torque can be figured out as 20A/Stall current * Stall torque. You will still see the same free speed, but only expect to produce that amount of torque in your calcuations for extended periods of time (greater than 1 second)... The spikes can handle larger currents for short bursts, but not for very long...
As suggested from 2002 year (manual), put an auto-resetting 20A breaker on the spike to replace its 20A fuse... that way you won't have to deal with blowing and replacing fuses all the time...