I am a fan of steel wheels, very durable and do not get damaged as easily as alloy wheels. That being said, larger steel wheels are heavy, increasing the unsprung weight. My '03 2500 Ram had steel rims on it when I bought it last year (plane jane tradesman model) and I recently started looking for a set of third generation alloy Chrysler wheels. Stumbled into a pristine set off an '09 with 40K original miles on the wheels and tires. (Factory wheels with Chrysler logos and p/n's on them). Swapped my tires onto them last week and was shocked at the weight difference, 17 lbs per wheel lighter for the alloy. (65 lbs vs 82 lbs for wheel/tire assy) It actually drives somewhat different with less weight bouncing around out at the corners. Easier to heft up and mount too.
Charles