What beamng drive needs 1. Tracked vehicles 2. Working winch 3. To be able to make road trains with the truck 4. Environment deformation like breakable buildings deforming mud realistic water and trees breaking 5. Breaking axels and cb when to much torque is applied with diff lockers on 6. Rain which you can turn on and off and it can make roads slippery and dirt roads change into mud 7. A really good rock bouncer 8. A cattle trailer for the truck 9. A proper car transporter instead of the box box trailer 10. A 4wd Unimog 11. A off road test area 12. And the best of all a army tank that can shoot ammo
These exists already 1, 3, 5, 7, 11, 12 some you need to download as a mod. There is mud and realistic water, but of course graphical effects of those will be probably improved in a future. You can try to drive a semi trough mud section in grid map, then try some off-road vehicle instead, there is quite clever physics involved which you sadly can't see in action. Below I put some links that you might find interesting. Here is tank in action: https://www.beamng.com/threads/simple-tank.51425/ I guess this classifies as a road train? https://www.beamng.com/resources/gavril-t-series-addon.178/ Rock bouncer: https://www.beamng.com/resources/dh-outlaw.2673/
