People are ignoring that ALL THE JACKS WILL WORK AT ONCE.
That means the jacks are getting power. That means the jacks are NOT stuck. That means the jacks are getting a signal. That means the lever on the side of the jacks are in the correct position.
The problem is either in the remote, or in the jack controller in the camper. The problem is electronic, and for most of us the only thing we can do is replace things until it starts working again.
It would be interesting if you could swap the wires from the front jacks to the rear jacks, and verify that the problem follows the wiring, not the jacks.