Mike needs a wireless camera that will work on his truck from 85 feet away. Leo says he can do that with a WiFi-enabled camera acting as an access point that allows Mike to join the camera with an app to see what's back there. RearView Safety is one example. Mike will also want one that's waterproof.
David wants to install some security cameras, but he doesn't want to pay for a cable length he doesn't need. How can he do that? Leo suggests going with a wireless camera setup. If he wants to create cables, instead of buying cables that are too long or short, he can build his own with attachments and a few key tools. But wireless is the way to go and most cameras use that. Axis has good wired cameras. Nest cameras are good for wireless.