I am putting together a old WWII 2 1/2 ton GMC and had a few questions related to modeling this guy.

Where can I find any more realistic driver than the stock Tamiya kit?

Are there any good am decal or transfer sheets?

Hobby Fan and a few other resin figure manufacterers have suitable replacement drivers. Archer transfers should be able to supply new decals but, to my knowledge, there is not a replacement sheet just for the GMC.

Cheers
Cliff

Accurate Armour makes a set of white letters and numbers so you can make up any set of markings your little heart desires.

WW2 US Army VRN & Unit ID numbers

they also have a set of various stars.

WW2 Stars

Like Cliff said, several AM manufacturers have released suitable figures like
Masters Productions :
one figure set (#35001)

2-figure set (#35002)


or Warriors :


Scale Model Accessories has released a set of dry transfer decals called "US Truck marking decal set" (#SMAP046) that could be worth a look (if I may say so, as there's no product picture on the site )
http://www.scalemodelaccessories.co.uk

HTH
Frenchy

Frenchy, thanks for that site, I can see an order going to them soon. :-)

Thanks for the help guys! All of those look great and should fit the bill nicely. Now I just have to make up my mind which to go with!