Thanks for all the ideas, but IKEA is out even if they allowed it. I am a full-timer and have literally almost everything I own in my motorhome, including spare electronics. I also have an electric bike in a locked bike rack on the back. I do not want to have to worry about someone breaking in while I am gone. I am even going to leave all my food in my refrigerator while I am gone. (Have left it for 6 extremely hot days in Salt Lake City with no problems last year, but may cut my trip to 8 days.
I don't mind paying $10 - $15 per day for parking, but it has to be secure and monitored. I will check into campgrounds nearby that might have secure storage.
I can fly out of Eugene, but I have a voucher worth $450 from Southwest that I would like to use and Southwest does not fly to Eugene. Also, Eugene has fewer and more expensive flights than Portland.