"Truly it depends on the operation you're running CDL drivers. If you're a construction company with short mileage radius and spotty drive time intervals...I would suggest the new division that AT&T has...https://wireless.att.com/businesscenter/solutions/industry-solutions/cross-industry/fleet-management.jsp
If you're running a true freight, cross-country, operation with multiple states...I suggest Teletrac...based out of CA. They were a true startup a few years ago, and now they've integrated the business from GPS tracking to ELD mandates that log HOS, and all mileage reporting for IFTA/IRP. It makes the whole process much easier when doing the quarterly reports. It's completely web-based and updates with changing regulations automatically. The database is kept on a secure cloud... I'm not sure what else more to add about it, but I'm happy to present a demonstration to whoever would want it. "