Ahhhhh so a raised coop.....
I had one 2' raised like you did. It was high enough for the birds to use that space and low enough I could easily clean the coop.
One thing to remember is you will need to access every corner under there. They will invariably lay eggs, become ill, act stubborn and go broody all in the absolute most inaccessible place posible.
I think 2' is a good height.....especially if you end up having to crawl under.
Tip: make access panels on the run so you can get to those tough corners.