I knew the steel vs. aluminum was gonna come up. I was just glad there aren't 5000 posts saying not to use spacers like there used to be a couple years ago. I've been running 2" and 3.5" 6061 alum. spacers between duals since 1986. Matter of fact, the 2" set on my '03 F350 has been in constant use since new and have hauled up to 36K all week, raced or sled pulled on weekends, and DD in between. Never one problem. Only problem is I can't remember the company name.....out of Ontario,Ca. I thought the Dodges had a little more offset than the Fords with 16" wheels. Seems like several people with second gens were able to run 305's without spacers due to the offset. 285's on my Ford with 2" spacers net me about 1.75" between duals. Steven.