Mobile DVR network issues. Please Help!

[fasteddie34 0]

Okay so one of my salesman sold a Speco D4M500 4 channel Mobile DVR. Its installed in a bus that parks outside the school. About 100' away. I do get good wifi on my laptop out there but how am I going to get the DVR on the network? It doesnt have wifi on it. Tech support suggested a 3G modem, but the customer does not want any monthly fees. I thought about possibly using a network gaming adaptor but im not sure how I will power it up or if itll even work at that range. The Dvr is hardwired into the aux power on the bus and starts automaticlly as the Bus starts. The Dvr has a Cloud Archive software build into it that you can set to auto archive but I just need to be able to get internet out to the Bus or a bridge or something. The customer does not want to go out to the dvr to pull video, but access the video from a server inside the school. Any info or Ideas on how to do this would be great. Thanks Alot