I have a series 9 book I picked up on ebay. It was a little worn when I got it so I don't mind letting it sit on the seat while I work on the truck. The worst of my copies of Haynes gets to sit out in the rain, under the truck in a puddle or oil, wherever it is needed.

I also have the chilton and clymers manuals. They are all three based on the same pictures, but each one has a few little differences or more info in some area or another.
The first thing any new luv owner should get is a Haynes manual, since they are still very much available and cheap. Once you get into some of the more complex stuff, then its time to get specific with a factory shop manual matched to your year. Just FYI when looking for the right manual: 72-77 = Series 1-6, 78-82 = series 8-12. Series 7 got skipped, probably just to get the number to match the year finally.