My '97 with factory tow package came with:
- Class III rated 2" square receiver tube mounted on a curving
square tube of the same size that bolts onto the frame
- 7 pin wiring harness with receptacle/cover mounted on bumper
- 130 amp high output alternator
- transmission cooler
- engine oil cooler (on 5.4L only)
- 3.73 differential ratio
- 78 amp hr. battery
- rear load leveling suspension (4x2 only)

Regardless of equipment don't exceed when fully loaded, the maximum GCRWR.
The LSD and 4 corner air I have were optional extras.