If you want to leave in the countryside then the best vehicle for you might be a flatbed truck since it could carry most of the produce harvested in your farm in one carry. You don't need to go back and forth all the way from your farm to the market. The gas might be a little higher than a normal car needed, but it would save you more money in the long run as it could carry lots of load compared to most of the vehicles on the market today. Living in the countryside doesn't mean that you should forget about pimping your truck as you can do that as long as you have the money for it.
The game is played with a mouse and the idea here is to pimp the truck. You need to be creative in this game and that is the whole idea. It is up to you on how would the truck would look like at the end of the game. Once, you finished pimping the truck then that would be the end of the game. There are no levels in this game and you won't need to worry about getting it wrong since there are no wrong approach in this game. Just have some fun and enjoy the game.