Actually, I did the same thing about 5 years ago. I took 2 quad wheel dollies and attached them togather with 1 and 3 2x4s. I made it so that the hard top roof is vertically plumb(sp?). I don't consider myself a crafter, but I was pretty geeked about the outcome.
I haven't put the top back on since I first took it off. I should probably sell the thing.