The info I got came from the link below, I also thought a 3 was a solo plane, I am guessing its a 4. I don't know the legal stuff on Ultralights but around Camarillo I see several with 2 people flying around the Ultralight field. Here is a link about the RV.
I don't subscribe to the Star so all I can see is the first paragraph, what he linked to was the complete story, I guess I am cheaper then him when it comes to paying for the paper.
What is odd that I was able to read the full story and I don't have a subscription. I assumed it would remain public. When I went back to look to see what you were talking about I see it switched to subscriber-only viewing. Sheesh.