[ksafin]

Originally Posted by EricH

There's a blue-and-white dually type I've seen around. That's pretty decent; I want to say it's a 4" size. I don't know any more about it, sorry.

Or you can go shopping AndyMark's collection.
4" dually http://www.andymark.com/product-p/am-0381.htm
All of AM's plastic omnis (which are cheaper than the Al ones) http://www.andymark.com/Omni-Plastic-s/69.htm

The only problem I see is leveling them with our 10" giant pneumatics. I'm thinking 8" dualies.

Does that sound good?