Some older DLC trucks are no longer sold individually, only in large bundles. An unlocker is the only way to obtain a specific truck without rebuying a Season Pass you already own.
If you're interested in accessing DLCs for SnowRunner but are looking for legitimate options: dlc unlocker snowrunner
: You cannot buy the DLC-specific trucks unless you own the pack, but you can drive them if your friend leaves them in the world for you. High-Quality Community Mods Some older DLC trucks are no longer sold