Deep Light now runs in ATS
American Truck Simulator runs on the same engine as ETS2, and both games are on version 1.61. So I installed Deep Light in ATS and took it for a drive.
Every check passed on the first start: all 11 lighting hooks, the TAA shader, the camera data and the replaced ambient occlusion. Upscaling to 4K and FSR frame generation ran at 110 to 130 FPS on an RTX 5070 Ti, and the HUD stayed sharp in all but 6 of 6840 generated frames.
Your licence covers both games. If you play both, you pay once.