Mobile tech is a good idea....
What do you mean when you say, "The slide motor has completely went out. " Does it still run and the slide will not move? If so that could be a broken sheer pin. OR does it not run at all? This is probably an electrical problem and not the motor itself.
Need lots more info.
Since you are in Alaska and the trailer is in LA....this really complicates things. Suggest you wait until you and your trailer are in the same place and then address the problem....Plenty of options in LA for repair.
Good luck with it.