I have been looking for GPS trackers for years but always been put off by the initial purchase and ongoing subscription costs, I purchased some a few years back that needed a sim card and they were OK, but you needed to top up the credit and charge them and so we ended up not using them.
A few months ago I did another search and came across GPS Bob (https://gpsbob.com/). I tried a few and think they are great, I now fit them to all our vehicles.
Go to their web site to find out what they do but basically for a one off purchase price (£140 inc VAT) you get a tracker with no ongoing costs that should last 5 years without needing a top up. They are easy to install and if you change the vehicle it can easily be removed.
I am sure there are better options for theft protection, but I find it really useful to see where teams are. Some will think it is all big brother and I am spying on the teams and it is true I can see what time they leave the yard, or if they are parked down the pub, or even speeding. But it is great to know where they are. I can let clients know when they are on their way, without having to call. I can redeploy teams who get done.
The backup has been great, we did have a few issues, but I contacted them via the web site and the UK based team phoned me up and sorted it. Definitely recommend.