I've repaired LED rope lighting in my stick house where they had installed 12v kick toe lighting under the kitchen and bathroom cabinets. I'm not sure if the same type of ropes are used in motorhomes or not as I don't have them in mine so I'm not sure if this will help you at all.
There are a lot of videos out there that will walk you through repairing them. I've included one below. Basically, you want to cut at the designated marks which will be between two jumper-wire points. Usually, you will see the cut indicators on the rope. In addition to purchasing rope light sections, you'll also need to purchase the splices and clips.