I would start with trying to locate the DC circuit breaker for the stabilizer, and seeing if that is tripped.
Boy, if rear stabilizers and maybe landing gear is being done with remote controls, this really cries for a standard circuit that cuts the power in 1 direction if the limit of mechanical movement is reached. I worked on simple electric IV poles that had this circuitry. Just 2 limit microswitches, although our large power applications might also need a power relay, too. When I was doing some research on the Domar (brand) of 5th wheel landing gear, I noticed they had a similar product for aiming the old satellite dishes that HAD a limit microswitch circuit.