I just picked up a new 5th-wheel and will do the official "new RV" thread once I get some more pictures. I have a 2-year-old and I would like to get a rail system for the entry to help her in and out...
Our little one is now 4. We would not let her on the steps without one of us until see was able to use the hand holds herself. Actually, when she was 3 she figured out if she took my fire poker and stuck the wooden handle in the outside door latch, she could use the 3' length as a lever and pop the latch, opening the door. I'd be more concerned with her opening the door or the screen door and dumping herself out of the camper.