Is there a good reference book that covers the main aspects of caravanning?
Yes, there at least two. The first is called The Caravanners’ Handbook and is by John Marchmont. It’s been around a long time but is constantly updated and is now in its eighth edition (ISBN: 978-0954069209). The second is the caravan handbook by John Wickersham (ISBN 1859608019). It contains all the information a caravanner will need when preparing for a journey and is also an essential glovebox companion for use en route and on site.