Everything you need to know is at  
D2S MTM2 Truck Making  and also at the  
MTMG  be prepared to do alot of reading, and just start out with some simple repaints and then work your way into binedit and custom jobs...
The best place for links related to anything MTM is also at the  
MTMG  ,, there are more truck/track tutorials and help pages i just dont remember them off hand at the moment so you may want to take a look for something more suited to your needs..
happy truck/track making  

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Malibu350