Ok let me explain my set up. I've got a zj first off. Then I made a rear bumper for it. The main structure is 1/4 inch thick 2x2. Off of that is 1/4 inch plate then the parts that are around the wheel wells are all 1/8th inch. I have a 1/4 lazier cut double sheer bracket for the trailer spindle sleeve and bearing assembly to sit in which is then bolted together with a 1" grade 8 bolt. The tire carrier is 3/16th 2x2 and 1.5x1.5 construction. The latch is a 1/2 inch threaded plate with a 1/2 grade 8 bolt. All is welded well not professionally but well. There is no slop in the hinge. All the movement seems to be the actual 1/4" metal flexing around the hinge point. Everything is also trussed up inside the bumper.
I showed a local offroad fab guy my work and he said all seems up to snuff and that actually a little shake isn't bad because that means the energy is transferring to the metal not the welds where if it was a ridged system it would transfer more energy to the welds. I trust his knowledge because this guy does full on chassis builds and has his own line of tire carrier systems for many jeeps and other offroad rigs.
Now when I mean shake it is a very quick slight shake and it is only when I go over major bumps like bridges on highways at highway speed or if I physically hit the tire with a quick firm strike.
I just wanted some more opinions from the fab guys here. And if it needs to be sured up or not I guess is my main question. I'm just a little uneasy with it I guess. I've had it and maybe put 1500 miles on it with no problems other then the shake.
And here is a build thread of the bumper and tire carrier the first page explains the bumper and the last page is the tire carrier part to help make sense of what I did.
Thanks for reading.