Hmmm... 6'5" bed, bathroom, sleeps three, under 1500 pounds... Can't think of anything molded fiberglass that does all that.
Beds in my Scamp
(and other similar 13' models) are about 6'2", you have to choose between a third bed or a bathroom, and the bathroom option usually bumps the weight
well over 1500 pounds.
With a bit of work, a vintage Hunter Compact Jr. might be made to work- they're one of the lightest, and the bed runs longways. You could probably fit three in the single 6' wide bed. You would have to build a bed extension in the aisle for the tall person and accept a porta-potty in a cabinet instead of a bathroom.
A tent trailer might be something to consider. They tend to be wider than most small FG trailers, so the beds are longer. The under-1500 pound ones won't have bathrooms, though. You'd still have to accept a porta-potty.
Other alternatives include a bigger tow vehicle or perhaps a Class C motorhome pulling your CRV.
Bottom line is the CRV's 1500 pound tow rating is pretty restrictive. We own one, but with 4 people, I feel a lot more comfortable towing our 13' non-bath Scamp
with our larger Pilot.