Joseph,
I didn't do much prep. I think I wiped them down first with MEK, then alcohol, then sprayed them with a relatively cheap rattle can of flat Rust Oleum. The paint job has held up better than most things at the 18k mile mark. We have a black and white theme, so flat black worked well for us.
I can appreciate nice aluminum wheels, I know how to keep them clean( I owned a car wash for 27 years) and looking nice, but I use my motorhome more as a tool, not garage art like you mention.
The commercial pads like Mike mentions look great, we just use chunks of pressure treated 2x8's. The only time I really screwed up( with pads anyway) and should have used a pad was when we arrived at a campsite in late fall on an afternoon when the temps had melted the snow some, I put the jacks down, during the night they sank somemore, then froze hard into the ground. That required a shovel to dig them out, another lesson learned.
Doug