You might check with moving companies. Some will put partial loads together and this helps save on the cost. This may take a little more time than hauling the load yourself or getting a firm load and unload date, but it will save money. If you have books, these can be shipped by freight at a low rate. Also, decide what you really want to move. It rarely saves to move appliances this distance. You may find by selling any appliances such as the stove, refrigerator, washer and dryer, going the partial move route by what you really want to take, shipping books by freight, you can drive your VW to Portland and be money ahead.
If you do decide to rent a truck, reserve it quickly if you are going before Christmas. Many businesses rent trucks around this time of year to make Christmas deliveries.