Not sure if TTW is compatible with FNVLODGen but I've been trying for a week now trying to get the LOD to work for both FNV and TTW lands. I was able to get the Mojave's LOD to work but every time the Capital Wastes would be full of trees with floating bits around them. I tried searching on a fix and found this thread.
https://taleoftwowastelands.com/comment/43818
Although I've tried already 3 different methods and neither of them worked. Is it possible to fix this issue or could it be because I am using Vurt's Flora Overhaul for FNV and the TTW version?