They are no more dangerous if you use common sense. The worse thing would be overfilling the tank vs. outside temp. Then you would be inviting the pressure relief valve to do it's function on a hot day. Then you could have a potential release of vapors right in your face with the way the Super M is setup. Keep in mind though that the pressures involved in an LP system are fairly low in the grand scheme of things.
As for tank punctures, that's the last thing I would worry about. I went to a special class once when I was on the local VFD about propane fires and that was a clear point they made about collisions involving propane powered vehicles, transport tanks and rail cars. i.e. Post accident photos of burned up rail cars with tanks fully intact.
The use of copper line does raise an eyebrow, but all the ones I've seen of this type have the exact same type and even in Guy Fay's book if you look at the W-9 LP (or was it a 6?) it has the same lines that are bent in the exact same way. They are, however, mounted between points that do not experience relative movement. Also the liquid valve has a flow check on it.
Another thing to consider with LP is that it actually has a narrower stoichiometric range for ignition than gasoline.
I would be more concerned with LP where hoses are involved, such as a fill line between storage tank and tractor; make sure it's in good shape.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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