I'm guessing you're talking about the Kodiak/Topkick chassis? 6500/5500? I would suspect they're popular because they are more heavy duty than say a E450 class C. And, GM actively supplied this chassis to a couple of high volume builders. I've heard they are very good chassis. I've never seen one made with a crew cab but that would be kind of neat. I'm pretty sure GM quit supplying to the rv builders now though. I think International is building a chassis that some rv builders are using. But if you're looking at used I'm sure there are some good ones out there. I'd make sure you could get one for much less money than a full class 8 truck conversion if you buy one. Because for the money I think you might be better off with a class 8 t/c, just from seeing how reasonably you can buy a used one these days.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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