We use the Atrack Al300 which will operates on both the  4 G and 5G networks of Telstra. Telstra has the best coverage for GPS tracking purposes with coverage for nearly all of the country. The AL300 is a dust proof device which ensures the best reliability, The  device we  use is shown below.

These types of modems can be installed in all types of vehicles or plant but installation is required to be undertaken by an experienced installer to ensure their correct operation. They can also be installed in compact spaces often found on excavators, as shown on the left.