Have ou searched the gallery for photos? If so, send a Private Message to someone who has done this cake to ask for tips/instructions. I've asked to instructions a few times and have always gotten a positive response with lots of help. I know I always share what I can too. Good luck! I've wanted to try one of those too, just haven't had a reason to yet.
Check the gallery i am sure there are lots of pictures. Just an idea, try modeling chocolate for the wheels. It taste great and really easy to work with.
I did one several years ago for my nephew. I think I used a bread loaf pan, and just carved it out a bit. Then I melted some chocolate and spread it around the truck to make it look like it was stuck in the mud. My nephew loved it.
http://www.cakecentral.com/cake-photo_511913.html
Good luck!! I'd love to see how yours turns out!
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