Two things I can think of. You should either flare the ends as stated or used approved propane gas hose, and always use teflon tape or pipe dope.
The other thing is, I have a 28000btu unit in my shop and I had to use a home style pressure regulator. It is different from the reg. you have in your trailer. These heaters run at different pressures than campers or gas grills etc: read the manual or call someone who sells them for the correct one. This may lead you to running a seperate line to the tank.
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