Your going to need to set up a WiFi network in the RV to make this work! I recomend a router/switch with WiFi buiilt in to make it simpler (since this is an RV I would look for a travel router (usualy connects to a 5V cell phone charger for power) so you can connect it to WiFi that a park might provide for your internet, but it is not necessary for this setup). Once you have that setup connect your NVR to one of the 4 network ports on the back of the router with an ethernet cable NOT the single colored port, this is for internet connection from a modem(if you not doing an internet connection just leave this port open)! Next you will need to get a WiFi extender which is just a box that plugs directly into an electrical outlet and a zmodo sPOE repeater to plug your cameras into to get power to your existing cameras. Now the problem with this is price about $60 for the repeater and $30 for the WiFi extender when you can just buy a two pack of Zmodo WiFi cameras for $50, once the WiFi router is set up with your NVR just don't use the other two wired cameras your NVR came with instead use the WiFi cameras! You will need an android or iphone device to configure the WiFi cameras on your network once you have that setup. Botom line is your going to need to plug in you NVR to a WiFi network!