Connect 2 Networks over WiFi

Hi , Im a beginner to networking. I am the software engineer on this project. I have a network with 3 server computers that need to travel around the country in the back of a truck. If something goes down i need to VNC into the network over the internet. How can i connect to this network to the internet without changing all the IP addresses? Each server talks to the other through static ip's.  Can i use a Access Point to connect to the network without changing ip's? Can i connect the router in bridged mode without changing the ips of the network? The persons operating the truck have minimal knowledge of computers. I need to make this as simple as possible for them to connect the system to a WiFi access point like McDonalds and give me VNC access to each server. Thanks for your suggestions!