Hitch?

I know this crazy but I want a hitch on my `68 dart. My car is a convert and I want to load the bicycles and cruise down to the beach. I have seen the old school bent flat bar hitches but that isn't going to cut it. I can't have one of those strap onto the trunk lid bike holder setups either. I want to use the bike holder that plugs into a square hitch. Anyone got any ideas or suggestions?