How long are you staying in Corvallis and how much driving do you intend to do? If you will be there for at least a few days and only plan to drive around town, then a simple 120v outlet will be more then enough. I've done many trips where I just plugged into a regular outlet at a hotel or house I was staying at. Those 3 miles of range per hour add up if you aren't doing much driving while in town!