FYI
I found this write up on one of the WD hitch sites.
Quote:
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Tongue weight includes the trailer tongue weight with full gas, water, waste systems and a packed trailer PLUS the car trunk load. Match the sum of these weights to the proper hitch. For example, a tongue weight of 500 lbs., coupled with a car trunk load of 200 lbs., equates total hitch weight of 700 lbs. This vehicle-trailer combination would require a 750 weight distributing hitch.Tongue weight should be at least 10% of gross trailer weight.
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Sort of explains why 750# or 1000# weight distributing bars are needed for a TrailManor with a factory quoted tongue weight of only 390# dry.
MJL
