Hitch carrier is easy and quick to put and take off. You can have it installed, and you are ready to go, or you can have it removed already in less than a minute. As for roof-mounted carriers, not so much. The first type is also less likely to scratch your car than a roof mount carrier. The best thing about hitch carrier is that you don’t need to lean up against your car or to load/unload gear over top of your vehicle. Thus, it doesn’t make for a top-heavy vehicle.
Aerodynamic and Clearance
Hitch carriers have minimal disruption to the aerodynamics of your car when it is mounted on the vehicle. Meanwhile, if you use a less aerodynamic roof carrier, it means that you have to pay more for fuel every time you use it. As for clearance, the rear-mounted carrier won’t bother you in the fast food drive-thru and clearing parking garages, unlike a roof mounted carrier.
Bent or Rise Shank Design
There are many rear-mount carriers which have a raised shank design that increases the bottom of the hitch carrier to be higher than the hitch receiver. It will help prevent the carrier from bottoming out on speed bumps, and driveway inclines when mounted to a car with low ground clearance. As for raised one, it will also help to increase the distance between your exhaust pipe and the cargo that you’re transporting. Other hitch mounted carriers have a straight shank, and this design will work well with the bigger vehicle such as the truck with rear mounted spares or the ones which are higher off the ground. The model will create more distance between the carrier and the tire for cargo.