From my 2003 manual:
Heaviest 4x4 is the Level II:
4320 automatic, 4280 manual
Lightest 4x4 supercab is the 2 door 4x4 Value Package.
3900 automatic, 3860 manual
Other 4x4 supercabs fall in between.
(These numbers assume a full tank of fuel and a 160 pound driver. No additional accessories or options added, no cargo and no additional passengers.)