yes..wait my mod to release...and you will have Exelent trees on 3000 draw distance...OK
Changing objects to the max draw distance can be very bad for the engine. you do not need to make an LOD for every object. I suggest you only need to make LODs for the buildings you only want see from a far.
Load up the normal dff in 3dsmax and do not reduce the vertices or faces, instead scale down these models by 5 units so this model just fits in side the orignal [name].dff with a texture size of 64x64. remove any other detail from the model just leaving the roof and 4 walls and then save this as the LOD[name].dff and continue to make the COL deleting the mash just leaving the pivot and bounding box.
Objects with alpha texturing like trees or metal fences will look terrible at 3000 draw units.
If you have to many dffs with alpha textures higher then 1000 units you will crash the engine.