I would bring it!! Saipan is awesome, I personally prefer Guam, due to access to the airport and more stores/dealerships, but its just a short boat ride away. There is a decent 4wd club in Guam, not sure about saipan though. Pretty sure our oldest son was conceived in Saipan....
What takes you there?
On a high note, your VX could never get stolen, it would be a one of a kind there, so no way to sell it, and it would be worthless for parts. There is a strong Isuzu presents on the islands, cheap 4wd are popular there for some reason.
Good luck.