"And the lehr had issues right out of the box."
That's because the dealer didn't do his job.
If you couldn't start the engine
it's because all propane is bled out of the lines before it's shipped. You'll pull your arm off getting it to start if you don't bleed the air out when it is first started. Lehr doesn't put this in the owners manual because they want the dealer to do it. It should be a one time procedure, but I like to show my customers how to do it. If they change to a long supply hose they'll need to do it to clear the air out of the hose.