You must place the ownable tanker 1.0 above Diesel DoubleandRMD trailers. You can use the scs templet to make skins for both the freight market trailers and the owns you can own. The ownable trailers have cargo names that differ from the freight market so that the cargos don’t over ride one another.
Credits:
G Force Modding
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@G Force Modding: You forgot the “Color.sii” file for the ownable part of the mod
it’s a simple fix though
do it like in this mod https://steamcommunity.com/sharedfiles/filedetails/?id=1612974101