I can't speak for the year model unit you are looking at, but we have a 2010 ElkRidge.
In July, my husband took a new job that was 3+ hours from our current sticks & bricks, so we opted to use the ER as housing for the time being until we could get our house ready to sell and be sure the job was a "keeper". Before this, we used our ER for vacationing, but we had month-long trips in the summer as well as week long trips other times in the year. We also have made modifications to use our ER during the winter months to go skiing, and took a trip to the Grand Canyon and Las Vegas in June, some of the hottest temps of the year.
What I can tell you is that the ElkRidge was not designed for full-time use, and is not warranted as such. But we've had very good experiences with the unit in mid/range temps, 45*-85*.
Colder and hotter, the unit is not as well insulated as the full-time units, so the ACs (we have 2) can't keep up as well, and/or the furnace runs more frequently.
The tanks are smaller than full-time units, so you are dumping more frequently.
The kitchen sink is on the small side, so washing dishes is a bit of a challenge.
Propane tanks are two 30# units, many full-time rigs have 40# so refilling becomes necessary sooner in the colder months.
Nevertheless, our floorplan works well for us and it has held up very well for 6 mo of continuous use. We are happy with our arrangement right now.
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