"Underhitched" - Any Evidence of Damage to WD Bars?

By "underhitched", I mean using WD bars which are rated for 20% or more below the loaded tongue weight -- for example, using 600 or 800# bars with 1000# TW.



Some AS owners are using bars rated for less than the TW in an effort to reduce the magnitude of road shock transmitted to the trailer.



I am specifically interested in any cases where using under-sized bars has resulted in any apparent damage to the bars.



I would need to know:

WD bar brand and rating,

loaded tongue weight if known - otherwise trailer's dry tongue weight,

tow vehicle type and size,

description of damage to bar(s)

possible road conditions causing damage.



Thanks for your help,



Ron