Any website with LARGE selection of different trailer hitch adapters?

[tomp]

Ran into a problem trying to tow a small little pop-up camper for the inlaws. The trailer jack hits the spare tire and there were no options except to remove the tire.

I have several different hitches to use in the receiver, so I need either an extension rated for towing or a website that carries different hitches with long tubes to reach out past the spare.