You might try doing a search. We have discussed GPS for truckers previously. There are several trucking specific units on the market. Garmin, Rand McNally, Cobra are the ones that I see most. I like Rand McNally. I have a friend who uses a Garmin, but it is not for truckers. It is a standard unit you would use in your car. TA may still have a Cobra GPS and CB 25 that you can purchase at a little discount. I have used Rand McNally maps for many years, so I personally like them. I have heard that the Cobra GPS tends to get a little confused if you miss a turn and it has a problem finding a different route. But, they make a good CB radio, so their GPS should be good as well. If you are looking to compare different units, you might go to
Dieselboss trucking site for semi truck driver products and trucker services. There are several listing. You want the one that has something about fuel prices. When you go to the website there should be something about trucking accessories or GPS. At one time they compared several different GPS units. It might help you to at least get a start. There is also a trucking show coming up in a few months. Some of them offer a discount on any GPS units purchased at the show. It isn't usually a bid discount, but anything helps. I don't own a GPS other than the one on my new phone. With any of them, you need to understand that they are not 100% accurate. You still need to be aware of your surroundings. Drivers still need to watch signs about bridge heights, weights, etc., You are still better off in this business with a truckers GPS than one for cars.