Thank you for reaching out - I'd be more than happy to clear up any confusion!
The Rota-Flex pin boxes, like part # LC176440, are NOT compatible with the E-Series and Q-Series Curt 5th wheel hitches because they have a spherical head which won't be stable enough to work with the Rota-Flex cushioning design. So if you really like the Curt 5th wheel hitch design you need to either swap out your pin box or you need to use the A20 Curt hitch which has a torsion head that is compatible with... view full answer...
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