Are you using wedges on the front or do your rims have the bosses to put the bolt through?
Either way... get some good hardware... grade 8 fine or course is probably OK... washer, then lock washer, then nut... Lube the threads before installing nut and use a torque wrench to properly torque the bolt and nut. I don't remember off hand if those are 3/8 or 7/16 bolts... Either way a chart for proper torque of size and grade fastener is easily obtainable via a google search.
The objective when torquing a fastener to the "proper" amount is to achieve A) a desired clamping load when holding pieces together and B) to stress the fastener (which stretches it) and the resulting normal load and coefficient of friction between the threads keep them from moving relative to each other... Generally acceptable torque on a fastener results in a load that imparts a stress equal to 75% of the yield stress value of the fastener. In this case I would gradually work my way around the fasteners until I obtained the desired torque in increments.. say I wanted to achieve 80 ft-lb... I would start by achieving 20 on all fasteners.. then load em all to 40... then 60... then finally 80.
The one thing that will kill you in this scenario is if your hardware between the bolt head and the nut can collapse or you are not drawing down on parallel surfaces and you get an offset load in the fastener... if you don't collapse ithe hardware and then achieve torque it will collapse when load is added via use... and you will lose your clamping load. Same goes for non-parallel surfaces. I figure that is probably what is happening here...
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