Over time and use the wheels have become quite "wobbly" in the back. It is loose between the stub axle (http://www.redcatracing.com/RC-Cars/Redcat-Parts/02033)
and the rear hub carrier (http://www.redcatracing.com/RC-Cars/Redcat-Parts/02013). I have upgraded the rear hub carrier to aluminum, the hex wheel nuts are aluminum as well
and the two axle sleeves do not appear to be worn or damaged. So what is causing the wheels to get so wobbly the truck looks like a beginner skater on ice?

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