Here is what BlueOx has to say
This subject can be cussed and discussed but here is what BlueOx has to say. This is taken directly from the installation manual.
Disconnect the towed vehicle from the towing vehicle before backing up. Do Not Back Up while vehicles are connected! Damage to both vehicles and the towing system may occur. The towed vehicle may jackknife causing abnormal stress to the tow bar, car chassis, baseplate and/or pintle hitch of the towing vehicle. These abnormal stresses may cause damage that may go undetected.
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