"Would you classify the founding fathers, the authors of the greatest document ever written as conservative or liberal?"

The founding fathers probably would best be described as "frontierman"- though they were mostly "city folk" the country in general was shaped by the fact that it was on the frontier. If you look at the time over at France and the rest of Europe- the liberals of Europe liked the romance of the frontier, and conservatives liked the opportuny of the frontier. But generally Americans left Europe because they wanted the chance of a better future than the future they faced in Europe. They liked some aspects of Europe, but wanted something different.
So, maybe you could say they were redneck liberals:)