Those Solera devices you've got are relatively common automotive IoT fleet trackers. They usually have gps antennas. They talk to the engine and transmission directly over canbus. Then they process that data and report what they see over a cell network. If they see nothing, they report that too with a heartbeat signal and various error codes.
Depending on the model, they sometimes have external cell antennas connected with a mini coaxial cable. Find it and unscrew it all the way, then re-screw it in by only 1 and a half rotations so it'll hang on but barely. Then clip the nearest ziptie so the cable wobbles free. It'll cause the nut on the coax to get a stress fracture in under a year. They will have to replace the gps/cell antenna module and those are like $300 a piece through Samsora. In the meantime you'll get iffy signal responses. Don't let them catch you cutting the zip tie on camera or you WILL lose your job.
Your truck will be in the maintenance shop relatively frequently at the request of whoever reads the reports for repair of that cell module. They won't find anything wrong with it, scratch their butts, then just screw it back down and replace the ziptie.
Unscrew it and clip it again.