Does MB offer a brake controller for these from the factory? If so, it will probably be a plug-in install on your van and may be worth looking into. Otherwise, the Prodigy brake controllers are nice.
GSI makes a 30oz java press, which is enough to make coffee for 2 and then have another press brewed up before the first cups are finished. It's the biggest one I've found so far. There's also the percolator option. Plenty of those in different sizes, though for trips where it's just my wife and I, I prefer the taste of the press coffee.