https://orangecounty.craigslist.org/rvs/d/idlewild-el-camino-or/6704018860.html Claims there were only 400 built, which is about 399 more than the market demanded.
My owner's manual has about one full page with a drawn picture stating that Rancheros are NOT to be used for slide in campers so I doubt that it is a factory option.
Looks to be fiberglass instead of a metal shell with a bird cage frame, that would make it to heavy right off the bat, but the slant to the back window looks pretty close.
This stuff comes from the days when people would make anything and before product liability lawsuits got to be fashionable and after about 40 years of folk lore associated with the stuff it becomes "facts". Like my Mustang wagon I built back in the 70s I still hear people at shows telling others about it being a factory job when it's always shown as custom built.
