Some roofs are made to withstand walking on, others are not. You can probably get on the roof, but if you do crawl on all 4's so all 230 pounds is distributed over more points. If you are able, find the roof trusses, put your weight over them.
I was told by my dealership that one of my previous trailers (Keystone Springdale) had a walkable roof. The first time I walked on it, it felt ok, but definately soft between the trusses. As I went to the back, evidently the trusses were farther appart and I heard a crack. I backed off immediately, and never walked on it again. I always crawled or worked from the side. The cracking never hurt anything.
My Keystone Outback had an arched roof. Dealership told me I could walk on it, and I did, all the time.
My Montana 5er now has a walkable roof. Actually, I could throw a party up there if I wanted.
So, it's hard to say. But basing the year of your model, I'd pretty much safely say ... you cannot "walk" on your roof. Crawl, do a belly slide, work from the side, yes. But not 115 pounds on one spot.