Tow bracket height on a Dolphin?

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Would anyone know the Tow bar bracket height on a 05 Dolphin? I have the batteries out and it's parked on a plot I'm renting, this has a slope so I can't get a good measurement, it looks like it's 22" on center of the bracket. My new towed is an Equinox and it has a 16" center, to make it horizontal with each other I'll need an offset bracket of 6" I'm hoping to leave right after Christmas I would hate to have gotten the wrong offset.

Thanks for your time