I installed wireless side cameras. You have to drill to mount and drill to access 12v
power supply. I had to make extension mounting brackets to clear the rolled up annings on both sides. I started with the following:
Voyager, 7" Wireless, WVOS713 (allows up to 3 cameras)
Then I added the 2 side cameras:
WVRXCAM1 Digital Wireless Camera and Receiver
Attached are a few pics of the extension bracket and mounting.
Everything works great, I'm glad I added them.