This is a feature in high demand from the community. It is even among the recommendations for addition to the next Farming Simulator. He is a modder who finally integrates the basics of used equipment.
Once installed, this mod adds, in the shop, a new configuration to all vehicles, including mods. "New equipment" or "Used equipment", the choice is yours. Concretely, once purchased, the equipment is a little dirty, worn, and displays a few hours of use. The discount is currently a fixed percentage, as are age, wear and tear and dirt. The modder plans to make these values more random in future updates. He also points out that the player still has the option of renting second-hand equipment, which may not be the case in the next version.
The idea is good and should please. This mod is ideal for getting off to a good start, and equipping yourself at a low price.