Mix,
Sorry to hear this happened to you. My sister had her Ford Explorer stolen like 2.5 years ago. They found her EZ Pass down in TEXAS! It was stolen from Maryland. The Vehicle was never found. She had a big ordeal with getting the police reports to the insurance company. THe car was tagged in Delaware so she had a Delaware police report, and a Maryland one. Then she had a hell of a time finding the title. She had mis placed it. Without the title, and a pair of keys, and the police report they would not cut a check for the vehicle. It took her a very long time to finally get a payment for the Explorer. A lot of that was her own procrastination though to be honest. When her car was stolen, a total of 5 different cars were stolen from a parking lot in the back of a shopping center.
Anyway, DO NOT go and spend thousands of dollars on un needed new equipment. You can build a micro system that is light weight, and exactly what you need for the events that you do.