OOPPPSSS,,This isn't going to end well!!

I would suspect that slideout on curbside is also extended.
Not uncommon for all slides to operate in series....one goes out, then the next then the last. Reverse for retracting.

SO if controller failed....none would operate.

None operating.....owner didn't have a clue how to 'manually' close

"Honey...we got a problem. Slides don't work"
"Sweety...don't fret I'll just have to drive it home with them open. It'll be OK. What choice do we have?"