Leisure Free Spirit SS (Single Slide)

Have you looked at the floor plan on their website? I can only see the possibility of two other people riding sideways on the sofa. Note that the website doesn't show seat belts there. I'm not sure that I would consider that safe even if there was a seat belt. And once the bed is opened, there wouldn't be enough floor space for them to sleep, so they would need a tent.

It seems that the Free Spirit without the slide might work better for your usage. (and it is about $10K less) It shows that it comes with seat belts in the rear.