There was a topic awhile back on making your Montana easier for folks to get in and out of that may have limited mobility. I have a wood 4'x4' entry deck and steps I keep at our home base CG. We really missed having a similar set-up the other 7 or 8 months out of the year.
Did some research and found this one:
http://www.hofmannccr.com
It wasn't cheap but very high quality. Since I ordered the package that will allow me to turn the steps in any direction, I suspect my total additional weight to haul this unit will be about 250 pounds. So I am in the process of dropping some weight in other places to make up for it.
I picked the unit up from a trucking terminal. When I arrived back at our RV resort it took me about 10 minutes to set it up. These are extremely nice units.