My wife and I are starting to get into overlanding in a mild way - crosscountry in the USA to visit various kids in college. Going off the advice of "the best vehicle is the one you have", we are planning to just use our current car - a 2014 Mercedes GL 450. We have done a lot of camping and so we are thinking the next step is to get a rooftop tent and some more built-in slide out drawers for the back to hold the stove, small fridge, etc. Anyone have any tips or recommendations to get going? It would be really nice to get a water storage solution so we can do cooking & camp shower. Any tips or suggestions would be appreciated!