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The independent hitch welding shops around here, (San Diego County) they weld up receiver hitches usually with 2"×2" material going through a square hole in a end plate that fits your particular vehical. That in turn is the mounting bracket to be bolted to your truck frame. So, the independent shops still or at least nowadays are bolted on. The independent shops also advertise that they are certified hitch welders. I have never heard of welded to the frame either.
I have heard from a friend that said my pintle hitch that is both bolted and welded to the receiver mounting plate has to be bolted if its welded. You can have just the 4 bolts holding it on. If its welded you have to have the 4 bolts also. He said highway patrol can write you up for safety violation.
Point is; bolting things up, if done properly is stronger in some cases.
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