I mean....I use them on the dually axle on my puller. A 1" spacer between the inside dual and the spring pack and a 2" spacer between the inside and outside dual.
www.trailsport4x4.com A lot of guys around here run them especially 2 inches. Even run them with 14 wide wheels without issues. If you get a good spacer and install them properly shouldn't have any issues. These guys have good prices and make a good wheel spacer for anyone interested.