Hello @emtishka
Unfortunately not, TruckersMP does not support mods.
Howewer if you want your truck customisations to be visible to others, you can try save edit, is similar as modding but supported with TruckersMP. Save edit gives you the possibility to change and add truck parts and paintjobs from different trucks by using codes.
If you're new to that i suggest you having a look to this save edit tutorial:
Also please, have a look at rules under §3 - Save Editing
https://truckersmp.com/rules#2-game-only-rules
Kind Regards
-TurboStar-