The number of washers is supposed to depend on wheelbase, so longer vehicles need that fifth washer to add a bit of leverage. What’s the tongue weight difference between the Outback and your old trailer? It seems to me that the washers give you a head start on how high to set the L brackets on the trailer. Just bring a tape measure and a big wrench (or two) with you when you pick up the trailer and do the adjustments there.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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