GarveeTech
This guide looks at GarveeTech Rooftop Cargo Box Carrier. Whether it suits you depends on your trip and setup, so the points below are taken from its Amazon listing and are meant to help you decide what to check.
Size given in the listing: 54.3 x 31.5 inches. Confirm on the Amazon listing before you buy.
GarveeTech Rooftop Cargo Box Carrier, Dual-Side Opening Luggage Storage (ASIN B0G11Y9QC6). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0G11Y9QC6).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.