COOLKING234 if memory serves me right & these are out of FS13, simply just back up to them until the "attach" icon appears then mouse control them up & onto the truck.
Upload the game modification into the file in our server or add a download link. Possible file formats .zip, .rar, 7z., .scs. We recommend to use MODS.TO
Coolking234
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N2o_injection