50mm ball is very common
Higher rating for a start.
There are new duofit couplings out that can fit 50mm and 1 7/8" balls
https://trojan.co.nz/Duofit-Coupling...-9b75491e9f30/
https://trojan.co.nz/COUPLING-V2-250...-f1ff6d501f82/
https://trojan.co.nz/Duofit-Override...-69d7ec1488aa/
https://trojan.co.nz/Duofit-Override...-5d3fb3959927/
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