My wife and my dream is to visit all of the National Parks in a class-A motorhome. I have heard about length restrictions at the campgrounds within the parks. I was hoping to find a resource which contains a list of all National Park campgrounds, specifically listing the campgrounds designated for large RVs. I have looked at the NPS web site, but the information is minimal at best regarding RV camping. This information will aid us in deciding what length of rig to purchase. Also, if anyone knows of any books about the subject of motor-homing through the National Parks would be appreciated.