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A hitch carrier does the same job as a roof box and beats it on almost every axis that matters. You load at waist height instead of over your head. A Class III receiver is commonly rated at 500 lb or more of tongue weight against a roof’s 100-176 lb. And the aerodynamic penalty is a fraction of a roof box’s, because the carrier sits in the low-pressure wake behind the vehicle rather than in clean air above it.
It loses on three things, all real: weather protection, security, and rear access. And it needs a receiver, which is the reason most people never get as far as considering it.
The number that governs everything here is not the carrier’s rating. It is your hitch’s tongue weight rating, minus the carrier’s own weight. Find it on the receiver sticker before you shop.