Curious if anybody has upgraded or replaced the cheap and under rated axles on their 4012 along with the springs? If so, what did you replace them with or do you have any recommendations? I did upgrade the tires and wheels 3 1/2 years ago which took care of the constant blown tires, 22 tires in 14 months to be exact after I bought it brand new. I have had 3 times while driving that I have lost an entire wheel/hub assembly, a miracle that nobody has been killed, so I figure before it happens again I need to go ahead and replace them. Any help or suggestions would be appreciated.