Typically, the largest O.D. tire size put on "lifted" VX's is the 35" O.D. The easiest fitting 35" O.D. tire for the VX with the least amount of installation headaches is the 285/75R18. Incidentally; the 285/75R18 tire will still fit on the 2000/2001 OEM 18x7 rim, and by doing so will reduce installation fitment issues to the bare minimum.
There are only four(4) tires manufactured in the 285/75R18 (35" O.D.) tire:
(1). Toyo - Open Country A/T (only A/T made in this size).
(2). Toyo - Open Country M/T (traditional non-studdable M/T tire).
(3). Maxxis - M/T "Big Horn" (only studdable M/T tire in this size).
(4). G/Y - Wrangler M/T-R with Kevlar (only asymmetrical tire in this size).