Mobile Billboard GPS – Discrete Wireless

This is a good company to track your mobile billboards.  They have the Marcus V8 and is the company I use for my mobile billboards. 

You can check out their website here; http://www.discretewireless.com

Here is their contact information on their services and products

Discrete Wireless, Inc.
1327 Northmeadow Pkwy
Suite 150
Roswell, GA 30076-3861
Main: 678-762-6800
Sales: 1-800-358-6178 or 678-762-6810
Fax: 678-393-8262