Thanks for the replies. After MUCH research and talking to Reese, Keystone, Lippert, MorRyde and eTrailer, this pin box configuration should NOT exist. The trailer requires a 12" wide box (Lippert 1621), but it has the 3 vertical rows of bolt holes on the side plates. Those will only fit 12 1/2 wide pin boxes. After consulting a hitch store, we are going to have to adapt a 1621 type pin box to the existing side plates by re-drilling mounting holes. Everyone says this configuration shouldn't exist!
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