Am I Just Naive

Seems like there are a lot of I's in your post and no We's. Here's a couple of thoughts. Your husband is starting a new business. Can he run it by phone, or does it require face-to-face meetings and an actual physical mailing address that he can check on a daily basis? Does he even know the answer to that yet? Can you afford to make payments on a Class A plus a minimum of roughly $900/month in RV park fees? Then add in the expense of fuel and maintenance on your rolling home. It has moving parts that require extra attention and money. Then there's the kids. 10 years from now, you'll have a 14 and an 11 year old with no friends except each other. And they don't make an RV big enough for them to have their "space" at that age.
I'm not saying that it couldn't be done. But it seems like you're asking a lot of your family to make your (that's singular) dream come true.