Jon, you got a chuckle out of that comment.
Ray, I didn't know you had an alignment, never mind then on that.
Look again at the Centramatic site FACs read them all.
Notice that they tell how the ones for duals are installed.
Notice that they speak of the amount of imbalance that various can correct.
Notice that the ones for duals contain more media for correcting a larger imbalance (two wheel assemblies).
Notice that in the various other sizes than 700 there is no mention of rear(dual) balancers either, but they surely must have them or they wouldn't be giving their specifications in the FACs.
I think the drives being heavier will cost more. It would be good to call their 800 no. to get it from the horses mouth! I think they want you to call for each application.
Sorry for all the notices. I couldn't think of another way to make you notice
http://www.nwtruckworks.com/search_r...00-630;600-640
Ray I noticed upon looking at a reseller's site (above) that they price out the duals and their pricing overall seems cheaper than the Mfgr.