Went to the Altanta Fall RV show and the local Rockwood dealer was set up across the street. (Way cheaper, they said) This particular salesman had a habit of climbing up to the roof and jumping up and down on the trailer.
Fortunately, I wasn't going to buy that particular unit. The dude had to be 240 pounds. So when you buy your trailer, look for mud on the roof.
But yeah, you can walk all over your Rockwood/Flagstaff, with some degree of care for the trailer and your own safety.