Yes, unless the vehicle's total permissible weight exceeds 3.5 tonnes an e-vignette is required.
All vehicles with a maximum permissible weight of over 3.5 tonnes are subject to the distance based toll system DarsGo.
You can now comfortably order your Slovenian e-vignette here.
Related articles:
What vehicles need a Slovenian e-vignette?
Which roads require a Slovenian motorway vignette?
Where can I register for the DarsGo and get a DarsGo device (OBU)?