What is making my propane regulators leak?

[Mike_and_Kathy_]

I have a new 2013 Thor Challenger 37DT that I bought in mid-August. The dealer had it on it's sales lot for about 8 months. I have had the propane regulator replaced twice in that time for leaks in regulator. Now I smell propane again at the regulator and the regulator is all frosted over. Temp outside is in the lower 60's.

What could be making the new propane regulators leak and why is the third one frosted over? Three regulators leaking in 2 months has got to be more than a coincidence. Could there be a problem with the propane in the tank that is making the regulators leak? It has a two stage regulator.

[enblethen]

It could be the model of the regulator. Look closely at the regulator, there should be a vent on the first larger portion of the unit. It should be facing down so the gas or what ever will escape down.
MHs normally use a horizontal regulator
Vertical regulator

Horizontal regulator