Yes, it is a subject which should be of major concern to anyone driving or towing an RV of any type.. However, there are too many out there that have never given any thought to anything except what they want to do, and that there might be something in their way never occurs to them. I have seen a lot of them sitting with major damage to the rig. Then there are a lot that just don't understand or know the height of their rig. So better be sure than sorry! If you don't know, go out and measure it. My height is posted on a tag on the dashboard. and it is right, but I always add at least 6" to what it says. If my CB antenna doesn't clear, that's it. when approaching something, I slowly test with the antenna first. But even that is not all the way across the top.