Welcome to the forum!
While I can't help, as to a quiet door latch, I do agree with maybe trying to train the kids not to slam. I know...kids will be kids, and everyone is in a hurry! I put a little teflon lubricant on the strike plate, and sloped bolt surface. It makes my door push or pull shut, much easier. Just don't use wheel bearing grease, as the kids will remove that with their clothes! :)
RV doors are not house door quality, and will not stand up to continuing abuse.
Jerry