I have a short bed F250 with a hard bed cover. Does anyone make a "tent" that uses the bed cover as the top? i figure put the cover up, secure it somehow and have a skirt thing that goes around and attaches under the bed cover with a zippered door.

 

Are you saying you have a canopy? If so you can get a small one that goes over the open canopy door and over the open tailgate from campmor.com.
They also have a full size tent with a sort of door/tunnel setup that will attach to the back of a pickup and canopy. I think cabelas has them as well.

 

I saw one at the keystone Atlanta show last year, it used electronic lifts to push the cover straight up. they had TVs under it, but I think they offered curtains. I can't remember much about them other than the TV's had a short that would shock anyone who touched the truck.

Then there is this Supertop® for Truck - Tops and Accessories for Jeep & GM, Ford, Dodge Trucks by Bestop