I think you will have to loosten the two #27 bolts, then #25 bolt, in order to get at the washer pin #21 to add or remove washers to it.
When you re-assemble, tighten bolt #25 first, then the two #27 bolts.
After you have towed the first 50 or so miles, re-check the bolts for proper torque tightness.
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2013 Jayco Eagle 31.5RLDS
2018 Silverado 2500 HD Duramax
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