From the company we brought our container in with:
"Mode of Transport
The Vanuatu Customs Act also allows a resident to import a mode of transport. This can include a motor vehicle, water borne craft or an airplane. Options can include a car, motorbike, yacht, motorboat, fixed wing airplane or even a helicopter. However, if considering this for a motor vehicle, remember that in Vanuatu we drive on the right side of the road and therefore any vehicle must be a left-hand drive. The Act is very clear in that it states that the mode of transport must have been owned and used by you for a period of not less than 12 months in the preceding 2 years prior to importation."
I have heard that there can be exemptions for certain cars that are right hand drive (classic, collector, hotrod) so may be worth asking your freight company for more details.
I would bring the bike, the ring road is great once you get out of town.