Thanks Cummins!
Here are some screenshots I took to illustrate these strips that fill up the bed corrugations. (or lack of it in the case of the Andersen)
Here is the Andersen Ultimate Fifth Wheel Connection.
Here is the BullDog High Rise Fifth Wheel you can use with a Cequent Gooseneck or a B&W. Its a beefy looking hitch with a single jaw design.
Finally, the New B&W Companion... Its awesome looking.
On edit my annotation below is not correct though...the strips under the Companion are also plastic.
It looks like Andersen needs to add some corrugation fillers to be on par with the other two hitches.
Thanks!
Jeremiah