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Not too sure about vehicle manuals or one's "comfort" default number. For me, I bought / installed many different hitches under my many Tow Vehicles - past and present. Think they where Hidden Hitch or Curtis hitch brand. Their documentation clearly stated "without WD hitch and WITH WD" numbers. Think it was 300/500 (or something like that). For better comfort, simply use 90% of both numbers. Thus, given extra buffer for double railways tracks and extra deep CG holes.
Bottom line.... What are the numbers on the hitch? If no numbers, assume you bought / installed your own Hidden or Curtis Class xx hitch for your specific make/model of vehicle. What are the numbers on their hitches? Would 90% of these numbers be more comfortable (for your own personal comfort)?
Works for me...
