For F19 Mods to work in multiplayer, each player in the lobby must own each mod you're running! So for example,
if you want to drive the “79 Single cab” and your friend wants to drive the “D110 Land Rover”, you both must own both cars.
Why do you both have to own the same mod
we’d like to mention this is a steam sided issue, as we’d love to allow you guys to show off your new mods to your mates etc
For anyone to see a car in mudrunner they must have it installed to their game, so basically we’d be giving a mod to your friend for free, and they would be able to use it in single player etc
