What's the difference between them? I have airbags on my truck as helper springs. Was just wondering if the spring rate or the arch of the springs were different?
You could only get a 4x4 dually in a cab and chassis configuration. The cab a chassis dually rear is also narrower than a regular truck rear. The easiest way to make a 4x4 dually would be to find a single wheel rear truck you like and buy a bed, rear and the hubs for the front rear and swap it...
I have a sky rsk with a banks intercooler. The only issue that I had was the end tanks hit the bolt heads for the rsk. I just welded the rsk at that spot and removed the bolts. I have about 1/8-1/4" of clearance between the end tanks and the brackets.