Stuckiness = Weight of vehicle / contact patch in square inches. (Lower numbers are better)Thank you these are very good points that I have not thought of. Can anyone make the comparison: which is easier to get unstuck a light or heavy truck?
Generally heavy trucks are way worse in mud. Simplest example is a diesel F250 vs a gas F250. The 1000#+ lighter gas truck completely shreds the diesel in mud. These big trucks can legally (within the wheelwells) use much larger tires though. 37x12.5 fits inside a Super Duties wheel well with room to spare. But a much lighter F150 on 35x12.5" tires will float right across wet grass fields that the Super Duty will sink in.
Sometimes a heavy truck will grip better at rivers or flooded road crossings. They will ALWAYS grip better at a boat ramp.
Generally, don't play stupid games on soft ground, and the fullsize is superior anywhere that it fits.