Klaus,
I looked up the vehicle registration document details of C60S with licence plate BE-15-69 (all details of registered vehicles are on line in the Netherlands):
Empty weight: 5.570 kg
Maximum load: 1.052 kg
Maximum permissible weight: 6.622 kg
Normally historic vehicles will have to be officially weighed before registration, so most vehicle documents will show different weights. Compare with C60S SB-01-24, for example:
Empty weight: 5.157 kg
Maximum load: 675 kg
Maximum permissible weight: 5.832 kg
At least they are well under 7.5 tons!
You are lucky you can drive a 7.5 ton truck on a car licence in Norway, the maximum here is 3.5 tons
Hope this helps, please share a picture of your Wrecker with us!
Hanno