I play Dragonfall Director's Cut 2.0.9.

At Feuerstelle I met a Ranger (in the room with the tri-vid player). He told me about some "gear" behind his van. But how top get this "gear"?

After we cleared the shrine, we left the compound directly to Kreuzbasar, no van on our way. Is this gear worth to worry about for a Street samurai? Or even to play Feuerstelle again?

It's in the garage back at the Feuerstelle - one of the rooms you probably didn't enter on the way to the boss fight.

From memory, all it contained were a couple of medkits. Possibly some drugs (maybe) - definitely only consumables. Nothing that's worth coming back for, for any character - I think it's mainly there in case you run out of medkits before the Feuerstelle boss fight.