God are you really that dense? If you wanna submit a cloned truck, this is how you do it, kids!
MAKE SURE YOU HAVE EVERYTHING YOU NEED TO MAKE TRUCKS AND TO CLONE THEM CORRECTLY!!!!!!
Watch the tutorial as many times as you need to get the process clear. Clone the truck while watching the video, I don't care, just make sure you do it right in the end.
Clone the truck right.
This is optional, but hey? If you wanna avoid not cloning it correctly, why not test it in an empty version of RoR? Remove all your trucks and put the truck you cloned into RoR to make sure you cloned it correctly. Whatever you cloned should be painted in game the way you painted it in your editing program.
Make sure there are no overwritten textures, meshes, or materials. This will automatically get your file deleted.
Once you go through all the above steps, THEN submit. I already told you how to submit so (HOPEFULLY) you should be clear with that.
Why not practice steps 1-5 a few times before rushing to submit the content? It may also improve your skills in the end and make you a GREAT content creator!
And next time post in Help and Support, or expand on the last question you asked if it's literally the same topic recycled.