Hadn't considered it for the bike, but may consider it for the car while towing. Our CX-9 has a backup camera in the dash, but it only comes on when the car is in reverse. What I really want is a view of the motorcycle on the trailer behind me while driving on the highway, as I have had a strap loosen up from time to time and the bike starts moving more than it should. Now we stop every hour or so just to check, but that does no good if it loosened at 30 minutes, and is a waste of time if it never loosens.
A standalone rear-view cam like this might be worthwhile, considering how inexpensive it is. ($99 - $129 depending on 2.4" or 3.5" display).
Link at JC Whitney