For adavanced user, here is a link to a file call No_3D_Kuju_Trees.7z (13.55MB). Unzip the file in a temp location, copy the Assets into your railwoarks folder and it will replace any Kuju 3D tree or line tree with RadioMaster trees.
The file is hosted on in files tab, No_3D_Kuju_Trees.7z :
http://rail-sim.de/forum/wsif/…-platforms-and-sky/#files
PS : You don't need to add RadioMaster as provider. The patch will act on any route using Kuju 3D trees.