Mario is in the truck industry for more than 3 years now. So far, all of his clients are satisfied with his service, thus, he is earning more now since he had built their trust in their relationship. Though, many still recognize by how he save the Mushroom Kingdom, that is a long time ago and Mario can't leave in the past. He have another mouth to feed as he is happily married and has a kid now. More than ever, he needs to double his effort in his business or he can't send his kid to a good school.
Wait till the items are loaded at the back of the truck before you start the engine. This game has no timer, but you can surely benefit if you are fast since you will get some additional money. But, getting there as fast as you can is not a requirement in this game. The idea here is to deliver the required number of items to the destination or you won't advance to the next level. Try not opt lose any of the items since each item will make you richer. You can use the money to buy some upgrades for your truck.