Having made many mods to coachs I have owned hitting wiring should not be of concern.
Take a look at this
LINK and you will understand my reasoning. You only have about 5/8's of a wall surface to screw into before hitting a metal stud your wiring is run thru the center of studs with gromets to protect them. When screwing into wall first locate a stud than measure out 16" on center for more attachments. Predrill holes for threading screws and use only short screws enough to screw thru metal of stud.
You can open the outlets for direction of wire runs but always hit a stud for screw attachment never just a wall space between studs a molly will just pull thru the foam and wall plywood.
Have fun with your mods.