We are 4 adults touring California and Nevada in June, with 4 large suitcases, plus typical hand luggage. Looking for a large car capable of holding the luggage comfortably, and not all car rental websites are fully explicit on this. Plus, if possible, we don't want something that's unnecessarily gas-guzzling. Our trip will cover a lot of miles so comfort is important as well. As we are not familiar with some USA models, can anyone point us in right direction re options of Cadillac DTS, Chrysler 300 or other similar?