I have a 280...the jacks in no way can be used to move the slides.
Included with the coach is a long (maybe 12") flexible socket extension you use with a drill to turn the motor mechanism of the slide to move it in or out manually. The motor is up on top of the slide and you need to remove the wood fascia above the couch area to get to it.
My only other comment on the jacks is that there is a manual flag type breake in the battery compartment to the left of the battery center box. If something goes wrong...that is the first place to check. With everything off...just flip the flag back up and try again. Example:
I have the accuslide adjustment and service manual in pdf format attached for you.