Here's what I found so far, secondary source wise. Unfortunately, no citations.
The Cimbri and the Teutones were not only more numerous, but had a discipline and order, an equipment, leadership and general sense of organization, which speak of a much higher social level than had been reached by the poor and backward frontier tribes of Germans along the Rhine. And it is fairly certain that the scanty social acheivments of the latter were a very misleading index to the degree of civilization reached by the Baltic peoples to whom the Cimbri and Teutones belonged. G.P. Baker, Sulla
I'll keep digging for more, I know I have it in my apartment someplace...!