Frequently when you are forced to go off the road into a driveway with a large slope or dip, the rear end of the trailer will sometimes contact the road surface. It's unavoidable. Usually there are several impatient drivers behind that dont understand why you need to take it slow, and so you try to move as fast as you think you can go. This happened to me on my way home pulling my trailer last weekend. My wife was watching me and she noticed something on the bottom of the trailer scratched the road surface.
I went to the back of the trailer and saw the first thing that's contacting the ground is the propane line that is to be used to hook up a grill at the back. Although the line has valve cutoffs, and you should not drive with the propane service turned on, it seems to me somewhat dangerous that the propane line can contact the ground. If you forget to turn your propane tank valves off, and you strike the pavement, rupture the line and create a spark, what will happen? I would hate to see it.
2015 Jayflight 23MB, 2007 Ford F150