[Riwright]

I am 6' 2" and further north of 200 than I like to admit. I get on the roof of mine from time to time.

I have a couple of planks that I use, a 2X6 about 4 feet long. It spreads my weight out.

I think you'll fiind that you don't need to "walk around" on the top of the trailer. You need to get to a particular thing and work on it. I actually do most of my work while standing on a ladder and reaching over to what I need to get to.