He wasn't really being and asshole, he was trying to give advice its called constructive criticism, remember in the world of phun its just advice, and i suggest you use it the next time you enter a contest. I wasn't able to test your truck due to all the illegal areas that it had and now that the contest is over but hey it was an pretty good but it would have performed alot better if it didn't lagg too much.
Oh, you hinge it to the truck, since its a contest you have to pull the weights (truck pull kinda thing) the green thing is the sled that you put the weight on