Same here,
our 4s gets used pretty much exclusively for touring two up with luggage, and I've never moved the lock rings.
I wound up the preload to stop grounding out on fast sweepy bumpy bends, and left it at that.
I did however adjust the ride height adjuster link to get sufficent ground clearance (my bike seemed to have a very low ride height when delivered from new).
Its been fine for the last three years (if you ignore the bent ride height adjuster, but that's another story
)
Cheers,
John.