I recommend the Grabber UHP in either of the two(2) tire sizes below:
A. 265/50R20 (30.4" O.D./37 lbs)
These will mount a lot better, and will likely not rub and may/may not require cladding trim (you won't know until they're actually on the VX). If you are totally skittish about any cladding trim, then this would be my recommendation.
B. 295/45R20 (30.5" O.D./39 lbs)
These are very wide at 295 series width, and will likely rub which will require a tad bit of cladding trim. However, they will look totally bad-@ss once fitted on the VX and give the VX a much wider, meaner stance. If you are willing to trim a little bit of the inner cladding, then this would be my recommendation.
