Yes but in a somewhat convoluted way. If you're familiar with the original Hills Have Eyes, both take place after they break down but No Man's Land follows Doug's path to the military area and this one follows the dad's path back to the gas station. It's like a Shrodinger situation where they do and don't take place at the same time. But to give you a more straight answer, No Man's Land is first and this one is second. There's also the night version of this one that thematically makes more sense imo.

Are Back to Gas Haven and No Man's Land related? if so, in which order?

Ok so I downloaded all the 17 other addons and it finally appeared. It's honestly a decent map.

Nope. The entire point of these campaigns is to be content for Right 2 Live.

just make a standalone version please.

Then you don't have the required content installed..

it's not appearing in the addon campaign list...

the long drive but its l4d

I just finished playing No Man 's Land and later saw this map,fantastic