Have you allowed to build up on your rig before climbing up and clearing it off? Got real worried with 18+ inches of Sierra cement and finally did it. Wasn't easy but what a relief!
Many FW roofs are considered to be walkable, or at least advertised as such. Most have a ladder for easy access. IMO, if a 200 lb man can stand on it, with no feeling of give, a moderate snow load will not be a problem.
When the temp is such to cause thaw, I like to push the snow off, using a tall step ladder, and my garage broom, with a 7.5' handle on it. I feel the thaw/freeze cycle is more damaging than the weight, of one to two feet of snow.