The 285/75R16 are 32.8" O.D., but we'll just call 'em 33's for all practical purposes. Thus, grab a tape measure and then measure-out 16.5" from dead-center of the existing wheel hub (radius measurement). Look specifically at the 3:00 and at the 9:00 positions in both front & rear wheel-wells, as this is the location where clearance issues are most likely to arise between the cladding and the new tire. Essentially, this is approximately where the outer circumference of the new tire will be and it will give you a general idea of any potential clearance problems in advance.
The 285 series tire (11.5" wide) is a fairly wide tire for the VX. To help keep this wide tire neatly tucked in the tightly cramped front wheel-wells of the VX, it is highly recommended to only use the Stock OEM 16x7 Factory Rims which has the proper offset/backspacing you'll want to maintain. The use of any other aftermarket wheel is only gonna' cause additional rubbing issues and a multitude of clearance problems.
When it comes to lifting the VX, there is basically three(3) phases:
A. No Lift. VX is left 100% at OEM stock height.
B. Front Torsion Bar Crank Only. OEM Rear Springs are left untouched.
C. Front Torsion Bar Crank AND aftermarket Rear Spring replacement (912, 913, etc) or OEM Rear Springs used with spacer's (for a minor rear lift).
First, mount the tires on the front axle, and check for clearance issues. You may find the tires fit perfectly with version-A (no lift) and with just some minor cladding trim and/or rear hammering of the front wheel-well. The new tires should fit perfectly fine within the existing rear wheel-well using OEM Rear Springs (no rear lift), as it already has gobs of extra space. Your only problem will likely be clearance within the front wheel-well and swing-arc clearance when the front tires are turned lock-to-lock. The true secret is to only use the Stock OEM 16x7 Rims with the 285/75R16 size tires!!!