Honda Pioneer 1000 2017 Owner's Manual page 200

Position 1: for a light load and smooth terrain.
Position 2: standard position.
Positions 3 to 5: for when the SXS is more heavily loaded. (Also
increase spring pre-load for stiffer suspension.)
Make sure that both shock absorbers are adjusted to the same
position.
Always adjust the shock absorber position in sequence (1-2-3-4-5 or
5-4-3-2-1). Attempting to adjust directly from 1 to 5 or 5 to 1 may
damage the shock absorber.
Auto leveling rear suspension is a rear shock absorber equipped with
a mechanism that controls the level of the lowered rear body,
depending on the weight of rear passengers or loads on the cargo
bed.