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...
Congrats on the new FW. I have not used a rail system, but to me it would just be in the way.
With the doors opening out, it is handy at times to reach things in the trailer, from that side of steps.
With a little 2 year old, I think it would be better to have carpet on the steps. You could show them how to crawl in, and back down, on the padded steps.