You can still separate it by folders but put a higher priority on the mod you wish.What means "first" ? Mod Loader loading mods simultaneously (as I know), means first install mobile fences manually by replacing .txd, and other stuff over mobile fences by using Mod Loader ? Anyway, your vegetation already includes some mobile fences, so may`be that is not a big deal to install all of them ?
You should install first the mobile fences and then my mod and patches, but yes they can coexist without conflicts in modloader or with a normal installation
Oh, one more question - do you use something to improve lampposts, like on the last screen in first post ? For me they look better then vanilla ones.
Go to the Game Menu > Options > Mod Configuration > Modifications > Vegetations Original Quality and increase it's priority so it's texture are used over other mods that would replace the same texture.