[Jon Stratis]

You say "van door motors" - which motors are you talking about specifically? Most teams would be using either the AndyMark Gear Motor (PN am-091) or dual Window Motors (PN 262100-3040 and 262100-3030). To use a van door motor, you would either have access to previous year's KoP's (several years ago they included a Van Door motor, if I remember correctly), or parts from the ARA donation.

If you're talking about the window motors in the KoP, I recall issues being posted in past years with them and specific speed controllers - when pushing against a load, the frequency of the speed controller would cause issues with running it in that direction.

Try switching the controller out for a Spike relay (if appropriate), or removing the locking pin from the window motor (an allowed modification).