In order to cheat making use of this SnowRunner money glitch, you’ll first need to progress through the game until you unlock the garage.
Then, hop into one of your expensive trucks and drive until you reach the point to cross to the Mountain River map. Park in the yellow area, then log out to the main menu.
Start a co-op session of SnowRunner, open the map, hop into the vehicle parked on the yellow area and transition into the other map.
As soon as your game loads, access the vehicle’s functions and choose Recover. This will take you back to the garage. Once there, select Retain for that truck, then exit to the main menu.
When you hop back in again, you should find that vehicle duplicated and ready to be sold for money.
Note: This glitch was performed on an unpatched version of the game. It will probably eventually get patched. To avoid not being able to use this exploit, either do not install new patches before using this exploit or delete the patches. You can avoid patches being installed by disconnecting from the internet until you are ready for the game to install new patches.