Man that is SO frustrating. Watched a guy leave his camper van at the Pine Ridge lot for three days last week. It just sits there while the lot fills up by 7 AM. Turns a nice public spot into someone's private storage. Makes you want to leave a note but that never feels right. The trash they leave is almost as bad.
Rocky Point trailhead has a dozen spots and rarely fills up except on weekends. Could be your neighbor is just avoiding street parking restrictions in your neighborhood.
Maple Creek trailhead has the same problem. Saw four trucks there Monday morning. This is a bigger trend. People treat public areas like personal property. It reduces access for others. Have a calm chat with your neighbor. Explain the space crunch. He probably just doesn't think about it. This selfish behavior is everywhere now. From parking to littering. Drives me nuts.