My roof was NOT designed to be walked on. I did in an emergency and thought all was well. Next trip out I found water dripping from a roof vent that was now low enough to collect water. I had to cut plywood shims to slide under vent to raise it up out of the new low spot. Learn from my mistake. As previously suggested check with Manufacturer.
Wonderful wife & 4 Really Fun kids
2008 KIA Sedona 3.8L 24 valve V-6
2001 Bantam Trail Lite B-19
It is NEVER a great idea to walk around you ANY RV roof but yes it is POSSIBLE. It's been my experience that people who go up on their roofs, looking for problems are very apt to find them (from going up there).
Don't walk, work from a seated or laying position. Don't put weight close to roof openings like hatches, skylights etc. IN order to work on some vents and hatches getting ON the roof is necessary but I would recommend using a ladder to get up there, placed as closely to the site as possible (not using the rear attached ladder and walking to the site) and don't concentrate your weight in a small area (by standing).
2011 F-150 HD Ecoboost 3.5 V6. 2550 payload, 17,100 GCVWR - 2004 F-150 HD (Traded after 80,000 towing miles) 2007 Rockwood 8314SS 34' travel trailer
US Govt survey shows three out of four people make up 75% of the total population