What Is It???

Looks like the end of the old style clothes rod.

I thought it might be something to do with a clothes rod but there is nothing across from it for the other end.

a/c vent like on an airplane?

Nope, not a vent. Looks like something might slide over it. Rear AC vents for chassis air is on the other side.

Cover on a thermostat sensor maybe?

Dave

No furnace.

Clothes hook / clothes hanger? Like some cars / trucks have over their rear passenger windows?

SInce no one had an immediate answer that should have been obvious to me, I explored a little more this morning. I decided the gray area was a cap that might pop off. I gently pried with a small screwdriver and it came off. Big anchor bolt underneath that appears to go into the van body structure. I think it was a spot for a shoulder seatbelt strap if wanted. There was a removable 3rd bucket just forward from the anchor that had a lap belt. I decided I need an extra kitchen cabinet more than a 3rd seat so removed the seat and base plate.

Thanks for the guesses, I was sure it was something obvious to everyone but me.

Thanks for the answer

It looks like the things on my B that are the inside anchor covers for the awning
john 'I am Canadian'