So there was a nuclear apocalypse. It doesn't really matter why. Most people now, about a few decades or so later, are scavengers. They take pre-nukes things and use them for shelter and utilities.
This woman, we'll call her Jane, she decided to use all of these old vehicles as shelter. Only, Jane has the brilliant idea to hook them all up to a big truck in the front, get some fuel, and create a mobile community.
The question is, is this possible, and how much fuel would it take?
For reference, there are 6-14 vehicles in this lineup. The lineup is made of regular cars and minivans, modified to provide more living space. There is also a doubledecker van somewhere and a tow truck in the back. For the most part, the community is self-sustainable. They grow their own food, collect their own water, and make their own tools. The only thing they can't create is gas, which they scavenge.
EDIT: the cars all run on regular gasoline. no electric cars and no diesel
SECOND EDIT: the cars are (hopefully) all hooked up via ropes and whatever else they can get their hands on. the vehicle pulling them is rather strong, and the second car in the lineup helps out, so ideally we only need enough fuel for the 2 vehicles. the vehicles also use about 5-7 litres per kilometre.