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Special GPSes for truckers are available from companies like TomTom and Garmin. If truckers are choosing to save a few hundred bucks by using their smartphones, which don't have the trucker-specific features, surely the fault lies with the trucker for using a consumer-grade product, not with the consumer-grade product for not being professional-grade?
A truck GPS is extremely helpful if you're driving a commercial vehicle any appreciable distance in an unfamiliar place. They include many additional data points in routing: vehicle height for overpass clearance, vehicle weight for bridges, "No Trucks"/"Passenger Cars Only"/"No Commercial Vehicles" restrictions etc. You can get yourself into hot water if you're following car GPS directions with even a mid-sized U-Hau…
Know your clearance and pay attention to road signs. Your regular car insurance may cover rental cars, but it probably doesn't cover rental trucks. So if you peel your top on a low underpass, you may find yourself in a world of pain and regret for a long time. Ideally, if you are in a rental truck, you should already know how to get where you are going without GPS assistance.