Vehicles for Dumb@%$#s is capping out at 2 reads. It will not let me get the third book.
Edit: Just for clarity. On a play through I found them at separate times. When I realized I couldn't get the third book I created a new game and consoled in 3 copies along with forge ahead and farming tips, placed them at separate slots on the hotbar and read them slowly. After the second vehicle adventures the third showed an open book and when I read it it went to the first spot that held it in the hotbar.