The # RM-077-6 is not meant for dolly towing, so the only option to use a cargo carrier and dolly tow is with an adapter, the Curt Multipurpose Ball Mount with 2" Receiver for Bike Racks and Cargo Carriers # D210.
This ball mount will give you 2-1/2" of drop, and to measure for the correct drop to ensure level towing, first measure from the ground to the top of your hitch receiver opening, then measure from the ground to the bottom of your dolly's coupler and get the difference. If your... view full answer...
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