Wow Marilyn...that's a pretty big rv to tackle but I'm sure you girls will be just fine. Like ya said..take it slow. If the turns are nice and wide, she shouldn't have a problem. Hopefully there won't be alot of traffic where you are going that day. I personally think that a sign like that is a very good idea.
I will say a prayer for you girls. Be safe and check in as soon as you can.