Just an idea, maybe look into that bus duct that they use for underground directional boring to run your air line in. Some of it is orange in color and some of it is black. It is one solid piece so you don't have to worry about couplings coming apart or leaking and letting water in(condensation is another issue). Also you cannot bend it very sharp without kinking it to insure that you can pull an air line around the corners easily. It comes in 1000' spools,but if you ask around at a telephone or electric company they may be able to find/cut off the length you need. After it is in you just take a shop vac and some baling twine, tie a Wal-mart bag onto the twine on one end and suck with the shop vac on the other. Now you will have a string to pull in an air line or a stronger rope to pull with. As far as burying a propane line in the same trench, I personally would stay away from it. Since you already have the trencher there it is only a little time to dig another trench.
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