There is an A/C outlet in the Westies but it will only put out A/C power when
the van is plugged into A/C power (at a campground or at home in your
backyard).  So if you want A/C power while on the road then you might want to
consider an inverter.  Or just get some extra batteries for your laptop and
then always park somewhere with a plugin at night so you can recharge every
night.
Have fun.
Ken Wilford
John 3:16