The bad thing about a RV is it does not make a good off road vehicle, and if there is a need to drive over curbs and around traffic jams, then it is not a good choice. However, there are a lot of other things to consider.
In the case of a huge emergency, and you need to bug out, the RV offers many advantages. Like,
You don't need to stop to use a bathroom. You don't need to leave your family unattended while you c**p in the bushes or in a bathroom.
You have your own on board kitchen also.
You carry your own water.
You have a place to sleep.
You can carry more food, clothes, guns and ammo than in a car or tahoe.
The RV offers the ability to cover the windows with curtains and stay out of sight. In a car with windows everybody can see how many people you have, ages, etc.
If you really think about it, you can come up with a lot of advantages.
You can also buy some cheap military type camo covering so that you can conceal the "big white box" in the woods.