Tip up and flip-over backpack class III hitch rack

[andrewwynn]

@srmmmm: that makes model was inspiration for my design but won't work upside down and I get a bonus tow ball in addition to less wobble. It's a decent value for a canned flip up.

@X53: oem receiver. Also you used "quote" vs reply so my entire first post is duplicated.

@JCL total weight about 120# for the tool boxes. Original rating of 500# on the carrier but I would derate to 400# just in an abundance of caution. 1/2 inch bolts grade 5 have 10,200 # sheer strength through the threads and there are two of them. I didn't measure the torque moment yet but pretty confident the bracket would fail before the bolt and its hefty 1/4 inch. Even basic steel is 40ksi means 10,000# force to start to deform.

Fortunately I'll likely never load more than 200# but will be doing some measurements to determine the force multiple on the steel pin and the bolts.



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