Please excuse the following butchering of whatever the following parts are really called.  

I'm on my second propane pigtail in 1.5 years.  The last pigtail only lasted 4 months.  The problem exists at the connection just in front of where the big valve screws onto the tank.  It also fails just after the previous mentioned point and were the brass collar meets the rubber hose.  Both of these points leak. I can smell propane whenI turn on the knob and if I bend the hose a certain way, you can hear the propane hissing out.  My 179 came with the black hard cover that goes over the tank and regulator.  The tight interior space make the hose coming off the valve that attaches to the tank to strain and bend just after the tank connection.  I think over time, it just wears out.  Has anyone else had a similar problem?  What was a solution that worked.  

I replaced the last one with a 32 inch hose hoping to give it more slack so that it wouldn't pull so much, but that didn't work.  What I think I need is a 90 degree connection right after the tank connection.  Or a higher quality hose.  Any advice would be greatly appreciated.  

Thanks

Jeff

There is a very good reason they bury propane tanks and lines.

Stored as a liquid under pressure if it is cold enough it does not turn into gas fast enough to sustain a flame.

If it was me either a Street L fitting or a hole bored in the cover should put a permanent fix on it.

Considering that you had a prior problem there I'd take it all apart. Make sure you don't have a partially plugged fitting or connection.

It was not that it was too cold. After I changed the hose, the propane supply was adequate. Propane's boiling point of  about -44F or about -42C (various web sites agree on these numbers) means that single-digit temps should not have caused the problem I experienced. The hose's internal valve somehow stuck and was not allowing sufficient propane to flow. There was no way to get the valve unstuck, even after I had it in warm temperatures.

One caveat to the above is that a tank that is nearly empty and is drawing fast enough to frost over might get too cold. However, my experience was that even a nearly empty tank in single-digit weather still supplied enough propane to run the furnace and stove simultaneously.