As someone who has had to have their slide rack replaced twice, my advice would be to don't mess with your slides. As I understand it from researching slides, your slides are designed to ride all the way in and are only to be used when the unit is leveled and the slides are all the way out. Plus, I don't think it would be wise (or legal) to have someone in your trailer while traveling. Passengers should seat-belted no matter where they are traveling.
I understand slide outs on motorhomes may be different, I understand that the slides in motorhomes may be designed to be used both retracted or all the way out, but best to check with your manufacturer.