Say, Bro, looking at the design of your " eagle " mirrors, they look pretty sturdy considering the lack of a 'tripod'. I was wondering if strapping the things to your truck mirrors with bungee cords to act as a brace / support, snugging the frame against your truck mirror. One of the concerns I had about that strap on type was what does it do to the weatherstrip against the window glass, all cranked down tight to minimize the vibration. Try that out on our trip to Tybee. Or sooner, if y'all go somewhere.
Andy, the wireless idea has crossed my mind, I already use one of those Wmart wireless jobs as a reversing camera on my Tundra, makes hooking up the TT a snap. Saves a lota creative language too, when my lovely assistant used to help guide the process.