Short bed ?? tent extension for camper shell?

is there a tent extension to allow for camping in the back of a short bed with camper shell? I would have to cover the tail gate so you could sleep in the back.

Thanks

 

I havent seen one that fits if you already have a camper shell. I have seen this model without the camper shell.

 

Thanks
I'm thinking of an extension of a shell like a snug top to cover my feet.
I think the double cab and long bed wheelbase might be too long for my use.

 

Im reaching here but, How about something like this

http://www.trdparts4u.com/PD-ARB102US.aspx?MakeID=1




more examples

http://www.trdparts4u.com/MC-DDGI-CEGG.aspx