Euro Truck Simulator 2 has indeed a VR-Version, but it differs to the main version so you can't use it in Multiplayer though.
Once SCS Software is merging the VR Version into the main Version TruckersMP is supporting, you can play VR on TruckersMP.
Until that, you have to decide VR and Singleplayer or no VR and Multiplayer.
Want to try out the VR-Version?
1.) Open Steam and head over to your game library
2.) Right-Click Euro Truck Simulator 2 and click on Properties
3.) Head over to BETAS and select the VR Version corresponding to your Headset and let Steam download the version
4.) Once Steam downloaded it, you can play it in VR (TMP doesn't support it!)
I hope, I could help you!
Kind Regards,
Maurice Bailey