Vehicle/Asset tracking work great.
Tract was able to provide a solution that allowed me to track both my vehicles and assets (Bobcat, trailers, and heavy machinery) in the same application. Tract's solution provides significantly more data points than their competitors, and at a lower cost.
Although the software and vehicle tracking devices are simple and easy to use, the need to recharge the Asset tracking unit makes it necessary to go get the unit when the low battery alarm is received so that it can be recharged. Not sure if there is a solar power offering, but that would make it easier for me than going to get the units once a month.