If you're not planning to go off road then an Audi RS4 or 6. Either way, to fit 3 cases in you'd need to drop a seat so unless you need the extra rear leg room of the 6, an RS4 would be ideal. Having said that, a friend of mine has an S8 with that V10 engine which they now use in the RS6 and its a beast of an engine( it sounds incredible!). If a diesel is what you're after, at my old job we used to use the boss's V10 TDi Touraeg for pulling loaded trailers. That car has some serious grunt, and was very nice to drive. The looks aren't to everyone's taste but I thought it was a very nice car.