Somebody with that trailer may know the answer. If not, try emailing Forest River. I emailed the same question about our 2018 Grey Wolf, and they emailed back with a 300# roof limit. I still scoot around on my butt to spread the weight - I'm around 210.
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Mitch in MN
2018 Patriot (Grey Wolf) 23MK travel trailer
2011 Durango 5.7L and OEM tow package
I was told that the roof on my Vibe is “non-weight bearing”. My dealer told me to stay off of it. Well, for proper maintenance you have to get on the roof. The roof “joists” if you can call them that are about 24”-36” apart depending on the model. I use a sheet of plywood to span the space and distribute my weight. Be careful not to slid the plywood as this could damage the rubber on the roof.
I have to put the cover on mine from the side with a ladder and a broom stick. It's a pain in the ass but I learned the hard way to NOT step on the roof of my Vibe. So far it's been a great little trailer. I did the roof treatments and a couple of seals but nothing major.