Black out Curtains Question

You can't "black out" curtains.
Industry standard = "Block Out" curtains = Fabric + blockout lining.

None is designed for airflow, only light block out.

You could use outdoor blind fabric (like a weave fabric) black in colour which will allow air flow through, but I'm starting to talk about a few $$$ for fabric and make.

See and outdoor blind supplier or your local canvas guy.

Cheers

or

use a black sheer on a top and bottom coated wire.

Is your camper canvas tent style?

John, Are you wanting to block out most light so you can sleep past sunrise or simply have non see-through for privacy?
Apart from a highly complex baffle system I can't see how it cold be achieved to have air flow without light getting through. I have several times had to arrange forced ventilation system for a photographic darkroom and it was complicated.

Our Troopy has dark red (although faded) curtains which provide privacy and reduce light but we are still awakened soon after sunrise. Curtains which are not restrained at the bottom do move somewhat to allow breezes in but they still restrict slight airflow somewhat.

Hi John,

With 35 years of selling window coverings i can confidently say no such product exists. Your best bet would be to buy some triple weave polyester fabric, available to order from most curtain retailers.
It is basically three layers of polyester fabric woven together.
The darker colours are total blockout and the lighter ones about 80%.
The advantage over back coated fabrics is they can be washed with out damage.
They will not allow any breeze through the fabric, but if you attach only at the top they should allow air to come around the sides and base of curtain. They also don't crease even when crushed as will probably happen in the camper.

Blockout curtains on all windows except last window replace with aircon unit :-p

Maybe look at ways to increase privacy with lighting.
Eg. Reflective films on home window glass, if at night and the inside light is on, you can see straight in.
During the day whe sun is up and more light on the exterior side, no view to inside room.

A bit hard directing lights on the outside into mesh, but maybe a few led lights at corners of camper, facing out, would be enough to make inside viewing through the mesh very difficult ?
Possible worth testing a bit.
That no see un mesh works good during the day.