I'd say no, don't try standing on the roof as it just doesn't seem that solid. We went through the same issue when we bought a cover.
We found the best (only) way to put a cover on was to fold it in half then work it on front to back using some 2x4s as lifting poles. Have someone on each side working to get the cover over the antenna and AC unit. It's not something you want to do each weekend. We put the cover on in the fall and leave it off all summer.
When it's off you should cover the tires from direct sun. A great idea (not mine) is to put a piece of plastic rain gutter over the awning to keep it from rotting.
Barry, MSgt, USAF, Ret. & Rose
2017 Ford F150 w/ 3.5 EB
2014 Coachmen Viking 17FQ