When my double-wide was set up they told me that these were used to connect the 2 units together electrically. There was a removable drywall panel in a closet that allowed access to clip them together after the units were in place.
I was told that the panel couldn't be permanently patched in afterwards because the connecteors had to stay accessible in case they needed to be repaired or replaced.
Concealing them was okay just as long as they could be gotten to at a later date.
