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Rims = depends on the van you end up with.

Half ton takes the normal 5 lug 4.5" pattern.
You can run lots of different wheels, all the way up to the Watanabe wheels like those shown on the vans pictured at 600+ each.
http://www.watanabe.com.au/
There are copies available for less if you love the look. I used to work for this company and they have 15x7 and 15x8 wheels. They are nice.
http://www.vtowheels.com/15-stock-product.html




There's also the Konig Rewind. I found this company. They're in Torance, CA and can make them in a custom backspacing. I believe they call it the 15" T/A...

http://psvintagewheels.com/products.html