Shoveling a roof? Please serious answers only!!.. How much would you charge to shovel a...

Please serious answers only!!.. How much would you charge to shovel a roof? Im discussion a LOT of snow off of 3 roofs.Then the deck as well. This is just about 5-6 feet of snow. Harnesses and adjectives. Not to mention we have to wander 2 miles to the place in the snow as near is no access in the winter to bring back there.
What are some pointers for taking and endorsement...
Answers:    Any place that holds five to six foot of snow on the roof should have a steep slope to the roof itself, (or the builder should be shot). Ever taken a accurate look at European Alps homes and their roofs?
So, that said, obviously you are up here by Great Lakes and having issues near recent weather, and there is "not easy snow" mixed in in attendance on the roof, or the slope would slough what is on it.
I would consider first, the trek in as arduous and time consuming, (where are the snowmobiles?}. Second, I would consider it hazardous duty and want menace pay which is premium, irrespective of the harness, etc.
So, my own perspective would be this: the trek at $30 or so an hour. The roof work, by the hour, at in the region of $50-60. Plus meals.
And, my friend, you better return with some kind of binding agreement concerning injury on the opening. Obviously you don't want to do it or cannot, but even with harness, if someone take a tumble, your liability is there.
Best bet would be to find a company that moves snow, and see if they will convey someone out to do the work; you pay the company, the company pays the laborer, and the company assumes responsibility for liability/workmens compensation, etc.
Problems near a dented boiler ?
It would depend on the size of the roof. I would agree to the owner/ operator know an hourly rate and next record the time it take to complete the job.