at home service is always sort of a gray area.. with oil changes and things like that for warranty purposes we accept proof of purchase of oil/parts as long as they seem to be installed properly its acceptable
with tire rotation etc theres no real way to "prove it" but if all 4 tires wear out evenly (ie you buy 4 tires, and they ALL wear out at the same time, the tire companies put up much less fight for warranty purposes. regardless of what/how many tires are being warrantied, 9/10 times im asked tread depths on all 4 tires in 3 places (inner tread, outer tread, center tread) these measurements will show over/under inflation, lack of rotation, improper alignment etc in most cases
sorry for the TJ!
back on topic sorta.. here is the michelin video circ was talking about, the very beginning of the video even calls needing 2 tires a "situation" ie not the norm
http://www.michelinman.com/tire-care...artire-change/
to the OP.
more info would be helpful in making a good decision too. actual tread depth measurements rather than %, the model of the tires in question etc.
if you do 2 tires, just be sure they are identical to the other two on your VX (size, tread pattern and speed rating, if they are factory dueler HTs be weary, there are 3-4 different types of dueler HT out there). and as stated before, make sure the new tires wind up on the rear both for traction and for the sake of your TOD
just to put into perspective, on a non awd vehicle 5/32 of tread is considered the max we will allow tires on one axle to differ to ensure ride quality/predictability and the VX essentially has a differential between the front and rear
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