Ok I 'll bite. There is an antenna mounted on the rear bulkhead just ahead of the rear axle. Coax runs up and then toward the front to the coach. Only thing I can think of is a receiver antenna for the PO tire pressure monitor system for the toad. Any other ideas?
I suspect the same thing-- a booster for the toad tire pressure monitor.
Pretty elaborate mount for that antenna. The installer had good mechanical skills and high standards! ^.^d