I recall ground score meaning you found a joint or a bag of mushrooms at the Dead concert
Well anyway Denis, that is a nice trailer. At 24' I believe it may be among the longest available with a single axle, and I think the models in that size were available in both single or double axle configuration. I do believe the early models like that one with single axle are among the most valuable airstreams, so it sounds like it was a real score.
You mention parking it in Malibu. Where? I ended up living at Malibu beach RV park for about 6 weeks while on my "magical mystery" RV trip. Great spot.