The 747's sixteen main-landing-gear wheels are distributed over four bogies: two four-wheel wing gear, mounted underneath the inboard wings, and two four-wheel body gear, mounted under the fuselage further back.
When the aircraft is airborne with the main landing gear extended, the wing gear tilt upwards, while the body gear remain level:
This is mentioned, but not answered, by this earlier question.
Given that the purpose of tilting the bogies is to reduce the longitudinal forces on the landing gear upon initial touchdown, it seems like it would make more sense to tilt the body gear as well as (or instead of) the wing gear, as - being further back on the aircraft - they are closer to the ground at positive pitch angles, causing them to touch down first and experience more-severe longitudinal touchdown loads, making the alleviation of these longitudinal loads more critical for the body gear than for the wing gear.
Why does the 747 tilt its wing gear instead of its body gear?