Both of these are built for the same job, which is keeping a 13 foot 6 vehicle off roads it will not fit down. They differ in the details rather than the fundamentals.
The verdict up front
Buy the Garmin dēzl OTR710 if you want the cleaner interface and the larger, easier-to-read screen, which genuinely matters when you are checking a turn at speed. Garmin’s truck parking and loading dock information is well regarded, and the interface will feel familiar to anyone who has used a Garmin before.
Buy the Rand McNally TND 750 if you want the built-in dash cam and prefer their approach to truck-specific points of interest. Rand McNally has been in trucking since long before GPS existed, and their routing reflects that.
What actually matters in a truck GPS
Entering your truck profile correctly is more important than which device you buy. Height, weight, length, axle count and hazmat status all feed the routing, and a default profile routes you like a car.
Neither device removes your responsibility. Posted signs govern, and every low bridge strike investigation finds a driver who followed a screen instead of looking up.
Cost that is easy to miss
Map updates, subscription features and dash cam storage all add to the running cost. Work out the three-year cost rather than the purchase price, in the same way you would for anything else on the truck. Our cost per mile calculator is built around exactly that habit.
If you have narrowed it down to one device, we review each of them on its own terms: the Garmin dezl OTR720 is the size most cabs actually want, the Rand McNally TND 750 is the fuel-price routing argument, and the Garmin dezl OTR1010 is what the 10-inch screen costs you.
