With 3dgs you have 4 lod stages!

example:
vec_set(d3d_lodfactor,vector(25,50,70));

from the camera till 25% of view.clip_far --> lod0
from 25% till 50% --> lod1
from 50% till 70% --> lod2
from 70% till view.clip_far --> lod3

I have the same models from Dex Soft, with 3dgs you can use only 4 of them. For example you can use the modells 0,1,2,4