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If you plan on mounting four bikes back there you will have to do like what the above post was showing. There is no way that the bumper will take the strain of that amount of weight and leverage twisting on it. You will have to tie into the frame somehow. The added weight will affect the tongue weight so you will have to be mindful of keeping weight forward in the trailer. A full water tank, dual batteries, and full LP tanks add a lot of tongue weight.
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My Great Wife Joyce
2018 Jayco Jay Flight 21QB
Formerly owned 1705T and 2310H
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
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