We were in the middle of making this idea for Unrealspeed when we closed down but a camper van race everyone will have a camper van trailer behind them and you have to complete the race with the camper van still attacted behind you. you caould give the camper van damage as well so each time it gets hit bits of it start to fall off until it can take no more and come off the back of your car in a spectacular roll. You could even have a last trailer standing race where you have to destroy everyone elses trailer and you could call it White Trailer Trash!