This does not come with a floor. I built the base with 2X4's and plywood. The dimensions required are online with the instructions before you buy it you can access these details. You have to level out an area and the base, or floor be level/to be able to square the framing while constructing shed.
Should fit with seats down. Weights about 200 pounds.
Yes, if it's a short bed pick up the tail gate can stay down
Yes it dos it comes with everything you need
71 5/8 at thr peek
The shed does not come with interior shelves but it does come with a floor kit as indicated in the description. It assembles into the shed very easily but I chose to add extra fasteners to the frame before adding the flooring plywood.
There is an option to extend the shed for extra cost
Yes, you could angle it in for even more room
No, just basic sidings and a roof.
72 7/8" at the peek