Easy solution, quit using antiquated methods no one uses anymore. Everyone of your trucker friends has a cell phone. All you have to do is have them turnon Location Sharing and add you as a friend. Not only can you see where they are at, you can zoom in and see detailed photographs of the area, track their speed and direction. So anytime you want to stick your nose in their business, all you gotta do is get on a cell phone, desktop and like devices to locate them.
Personally, if a friend or family member asked me to share my location, and a few have, I tell them to fold that request five ways and stick it where the moon does not shine.