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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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