Go to the render request thread and attach the tga files from each one.
To get the TGA file, you simply go into the opponent manager, select your car and hit the export button on the bottom right.
Now do the same for you truck (you have to switch mods).
Now close the game and click the Start menu on the bottom left of the screen and select My Computer.
Find the C:\ drive and select Papyrus\Nascar Racing 2003 Season and then exports and imports folder.
Now select the 2 files you just saved by holding down the CTRL key on your keyboard and click each one.
Now right click on one of them that's hilighted and either compress with winzip or send to compressed folder and name it racecars or something cool.
Now come to the Render request thread and create a request and post the folder with the 2 TGA files inside as an attachment to the post and Dave will take care of you.