Haven't bothered... my trailer is low enough to the ground I really don't worry about it. Now if I had one of them big fancy Voltages I might have something to worry about.
One of the things we really like about the Coleman is the fact is only has one step, my Airstream had two, but we only used one of them most of the time. My next trailer is likely to be a Lance, and they are only a two stepper also. Most of the manufacturers seem to have gone loco and put the trailers 30" in the air. I don't like it for a variety of reasons, having to climb stairs being one of them.