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We have the 3231CK with similar 16K GVWR and loaded, the pin runs about 3100 lbs. Also similar Ford truck. We added 2800 lb rear SumoSprings mainly to reduce the shock at bridge abutments. The truck used to bottom out against the jounce stops. They also raised the truck about 1 inch so the rear helper springs are not weighted. Super easy to install, diy < 1 hr.
That being said, we have the Rotaflex pin box but still looking at a more compliant box. We’ve got an Alaska trip planned this year so now considering the Goosebox from what members have said here.
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2021 3231CK, Legacy - dual panes, Kodiak 250 discs, slide awnings, iN-Command, TST-507, 206 Ah SOK LiPo, AC soft start on rear, Starlink RV
2021 F350 SRW CC, 6.7, LB, 4360 pyld, 2800 lb rear SumoSprings, spray on bedliner, 19K Demco Recon on factory pucks, CA non-commercial Class A
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