From about 64 to 67, the US Rubber company entered a venture to produce a clamshell-style camper made of Royalex, which was an early form of ABS plastic with a foam core. Seems they
sold the design to Travel-eze, who marketed it as the Royal Traveler, or possibly Roya-lite. As I've dug thru the internet, it seems the Stewart Coach Company might have done the prototypes for the design?
Interestingly enough, the Ford Motor Company also tried Royalex, presenting the Bordinat Cobra XP at the 65 Milan Auto Show!
Anyway, there's a few posts on here about 64 thru 66 Royal Travelers, but ours is a little smaller than the 18' campers shown. There's one post from 2010 or so with a unit very similar to ours, maybe 15' with a little different layout to the Travel-eze...
https://www.fiberglassrv.com/forums/...tml#post162450
Looks like the camper in these pictures had its (single axle) wheelwells filled in for some reason - I can't imagine it had tandem axles with 10" wheels in 1965!