About a month ago we bought the Big Berkey with the 4 black filters to take with us in the TC. A survivalist company seller through Walmart had a great special with 4 filters for the price of 2!
In the meantime we are using it 100% at home and love it so far! We used to take our Brita pitcher with us, but those filters really don't do much. Plus the Berkey is also a certified purifier, not just a filter...so in the apocalypse I can have clean water from any source!
There were several times during our AK trip we would have liked to get some more water at campgrounds, etc. but sometimes it said to boil first! You can't boil that much water and we don't want to contaminate our FW tank with questionable water. The Berkey just seemed to make sense for us in multiple capacities and takes away a lot of the water worries for us, on the go, at home, when the SHTF.;)
We will have to figure out exactly how to secure it during travel so it doesn't tip or slosh. I have seen others set it on the floor and bungee it to cabinet hardware. When we travel on rougher roads, we may set it in a "tub" and somehow attach.