Camperguy,
I have a 2500HD also and looked into adding duals with adapters. I consulted a mechanic freind and he said the problem is that the outter wheel moved the vehicle weight to the smaller outter wheel bearing and reduces the load on the larger, stronger inner bearing. This could cause early bearing failure.
How much this has an effect I don't know.
Hope this helps. If you find an adapter manufacturer that has already addressed this problem I would be interested in looking at the conversion also.
According to my freind, he suggested changing out the entire rearend with a dually setup. Also gains the larger brake system and other components. Unfortunatly not inexpensive and results in two different type spares I would have to carry.
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