The 4" bumper can't carry much except a sewer hose and a spare tire with rack. If you're considering a "bolt on bumper receiver" similar to the one in this picture, the bumper isn't rated for that and will likely either fail, bend or the welds will break if you add a cargo tray or a bike rack to that type of bumper receiver.
I think the general consensus is: "Don't do it".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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