Happy to hear that it is improving. That smell, hot buring plastic, is exactly what we experienced and so have many other on here. I suspect that it will get much better with a little open window fan on use.
By the way, not a bad idea to keep a portable electric heat in the trailer. When at an elec hookup...use thier electricity -- you paid for it with you stay, and hang on to the propane.
Couple years ago we were in gold beach in July. Much colder that I expected. In fact one day we for a Jet Boat ride on the rogue, had a blast, but ended up buying lots of logo fleese becasue we weren't prepared for the cold summer. Heck, we are a california family.