I am not a structural engineer but neither are you. Weight spread out over a span of roofing is different than weight distributed over 4 tires which I am guessing would be a square foot or two. If you took your truck apart and spread the weight evenly across your roof then we would be comparing apples to apples. Your statement about parking your diesel on the roof is off-topic. I am guessing the 'experts' here have no experience with snow load nor Michigan law nor how snow load relates to Michigan law, which is the help I need. If you don't like my math then find credible structural engineering to refute it.
I invite you to stand under the eave of my much larger metal building next winter on the first sunny day after we get at least 8 inches of heavy wet snow. Please wait for the snow to slide off the roof on top of you and see how you would describe what happens to you. I will supply the violin music for you. You know nothing about snow and this issue. Why did you make your comment? What was your purpose?
Are you making up your own engineering math or do you have a source to base you 1 lb snow weight from? FEMA gives a weight of 3 lbs per 6 inches of light snow per square foot. Where are you getting your less than one pound statistic from?

