JeeperKate--- YES, your new 285/65R18 (32.85" O.D.) Nitto Trail Grapplers will fit onto your OEM 18x7 rims with no problems. 285 series width is the widest series tire that can still be "squeezed" onto a 7" wide rim. Some commercial name-brand tire shops strictly go by the manufactures recommendation to CYA, so find a local Mom-n-Pop type tire shop to get them mounted/balanced.
Being a 32.85" O.D., you will have to lift your VX slightly; perhaps with some minor TB cranks and 1" spring spacers on the rear springs should suffice nicely. Only lift as high that is needed to safely clear the tires from rubbing. Lifting too high may cause increased CV wear and other unwanted stress's on the suspension.
To my knowledge, YOU will be the only one here on VX.Info that has put 285/65R18 on the OEM 18x7 rim (most of us go for the stubbier 285/60R18 size in 31.3" O.D.). However, they will still fit but may require a small bit of lifting due to their taller O.D. of 32.85".
Post some pictures when you get them on; we'd love to see the new look.
