The offset does matter when comparing a Trooper wheel to a VX wheel.
If they fit on the trooper, then they'll go on a VX. The question is the front fenders. Will you be able to turn with these wheels (and whatever tires you choose)?
Here's the calculations:
(width/2)- offset is how far the outer edge of the rim will stick out from the hub. This leads you to the circumference of the circle your wheels turn in.
stock: (7" / 2) - (+38mm) = 3.5" - (38mm * 1"/25.4mm) = 2"
mine: (8" / 2) - (+10mm) = 4" - (10mm * 1"/25.4mm) = 3.6"
yours: (8.5" / 2) - (+8mm) = 4.25" - (8mm * 1"/25.4mm) = 4"
This means your wheels will stick out 2" more than the stock wheels. On our VX, that's a lot, but workable. You'll need pretty low profile tires not to rub the front fenders at stock suspension height.
Whether they will work or not depends on the tires, and the overall circumference of the wheel plus tire.
My tires have a overall circumference of 30.5", and I only had to trim the front fender a little bit at stock suspension height. Since your's stick out more than mine, I'd say don't try tires more than 30" in circumference. Stock tire circumference is about 29.5".
Figuring low profile tires on 20"x8.5" wheels, I'm thinking tires sized around 265/45R20 *might* work. Going lower profile would obviously be more likely to work, but would also leave more space between the fender and the top of the tire. Wouldn't look ideal. 275/40R20 might be another size to try.
-Daver
PS Do keep in mind that this is all guesswork. Only way to be sure those tires fit is to have an installer try them. Typically this is not possible for ordered tires, so find a place that has them in stock and will do a test fitting.
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