I've walked on the roof of my Catalina many times doing maintenance and upgrades. That is including washing it twice a year as recommended in the manual.
Limit your jumping around and parties up there and you will be ok!
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Beau & Sue
FurKid Express
2015 Coachmen Catalina 303RLS
2016 Chevy Silverado LT 2500HD Duramax
The more people I meet, the more I like my dogs!