The uncompressed length of the springs on my Andersen hitch are 2 15/16 inches.
When I developed the table that I shared on this forum on March 11, I had assumed they were 3 inches. Since the compression figures were developed by subtracting the compressed length from 3", they are off by 1/16".
Last March I determined that the best compression for my lightweight rig (Honda Pilot 4WD, Lance 1575 trailer with gross weight of 3500 lbs) is a compressed spring length of 2 7/8". Turns out that is a compression of 1/16", not the 1/8" I thought it was.
The new corrected table is below. The amount of WD per spring compression setting makes more sense now, IMO.
Sorry for the dumb error.
Bruce H.