In a lot of the patch areas here in Texas the ground would either be red or black both when dry would be so hard you would need a jack hammer to break it up, but let it rain over night and the surface would turn to grease. Even the gin pole winch trucks with deep lug tires would just spin and slide but throw on a set of 3 railers and you could go like being on a highway, that is until enough traffic over the same area made the ruts so deep that the skid plates under the engines started pushing mud. By then you were left with only one option get a cat to drag you around. Less unnecessary movement or simply calling it a mud day would have saved everyone even the drilling company and producers a lot of money.