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A rolling hitch
The hitch receiver on a 2003 Ford Explorer is 2" x 2".
2" 5/16 or a pintle hitch
1 in 6 = rolling a 2
5 in 6 = not rolling a 2
CHiPs - 1977 Hitch-Hiking Hitch 1-17 was released on:
USA: 9 February 1978
Belgium: 2 September 1981