I'd look into reese hitches, or contact your local UHaul dealer (they have some places that install hitches) Dodge might even have a hitch that would suit your needs.
I just went and looked at it, it's a rigid hitch,1 1/4 x 1 1/4, bolt on hitch, with a hidden cross tube, part #R2-0156 3500LB MAX TRAILER WEIGHT, 300LB MAX TONGUE WEIGHT
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