What's on this roof rack?

[JWilliams]

I was surfing and found this picture of a trek. Anyone know what is on the roof rack?
Is it just a filler piece for the show? It covers another spare tire on the rack it looks like. http://www.safarigard.com/Discovery%20II/Side.jpg

 

[jhmover]

Sealy Posturepedic?

 

[Greg French]

Visco-elastic memory foam developed by NASA

 

[draaronr]

Sealy Posturepedic?

I was thinking the same thing.

 

[jmoore]

Is that spray on Mud? If so, where do I get it? LOL!

 

[chrisvonc]

I cant call up the picture for some reason but if its the picture of the original show TReK truck, yes, the rack length storage bag only had a foam insert in it.