I don't think the axles have ever been that much of a problem. How often do you hear someone breaking an axle. Sure it happens but It seems the springs,u-bolts, and brackets are more of the problem than anything. If Mor-Ryde and Lippert would build everything heavier and reinforce the stress points then Mor-Ryde probably wouldn't have near the I.S. business that they have. I can agree that commercially there are still a lot of axle and spring trailers out there with some running 100,000 miles or more in a year but they build there suspension to handle the weight they carry. I doubt these rv's are strong enough to carry there own weight much less the added capacity we all add ourselves.
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