With a 31 foot coach, Wireless should work, but if you have wire there already, that will probably do just fine. Even the new color cameras will work with old video coax.
I have known of the wireless to get confused and show the driver what is behind the coach next door.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.