Saw this book on Amazon.com:
"US WWII GMC CCKW-352 & 353 2 1/2-Ton 6x6 Cargo Trucks"
Tankograd Technical Manual Series No 6015.
It was all of $12 (I had a gift cert) I think $19 full price.
Its in English and German, and contains lots of period pics of CCKWs in use and undergoing maintenance/repairs. There is not a lot of new info.. as most of the data comes from TMs (you'll easily recognize the TM pics if you've read the TM9's). The book also states that it is NOT a restoration guide. Nice bit of honesty on their part.
But the main reason I got it was for the maintenance pictures. All pics are B&W, but are crisp and clear. Many engine shots and lots of engine removal shots. One nice added benefit is that registration numbers are listed if known. It also uses the '1-4th Series' classification of trucks to put them into general categories. Another nice touch
Lots of trucks have names, and some have quite a few interesting stencils applied.
Very interesting book simply due to the pictures of CCKWs in service and under repair.