Windstar hitch

How is the hitch bolted to the frame of a 98 Windstar? There seems to be no way to get the bolts inside the frame channel or to hold them after while tightening. Do you have to remove the back bumper or take up the floor mats? Or is fishing involved. What's the secret?
Thanks,
Joe

Fishing.

The bolts are droped thru by using wire to guide them, and have "ears" on them so they don't turn while you tighten the nuts down from below.