Germans used all small arms, trucks, tow tractors, light, medium and heavy tanks. Many types of aircraft were also captured intact.

Vermacht relied heavily on captured equipment throughout the war, and not only of Russian origin

I think it was not captured material that German Army got the most use out of Russia, but the Russians who willingly went to work or serve in the German Army (Hilfswillige).

In the German Army a vast number of support personal came from defectors in Soviet military or people who enlisted from occupied territories.

I got these numbers:

Spring 1942- about 200,000

July 1943- about 600,000

July 1944- about 800,000