You might find out things you don't want to find out about your trucks. Had a client that kept having fleet truck problems. Someone talked him into putting GPS on his trucks without his driver's knowledge. Over a few Saturdays in the summer the device was showing the truck had been running all day but had hardly moved. Curiosity finally got the boss and he confronted the employee. Employee confessed that he'd rigged up his hay rake to pull behind the truck.
We are doing a very large rollout of Samsara and have been very happy with it so far. We spent a lot of time looking over various products and had a few different GPS/Telematics systems at locations around the US so had some real-world testing and feedback from the fleet and safety guys that use it. Not sure how small of programs they offer but happy to ask our rep or just inquire on their website.