The Mille Miglia, Targa Florio, Tourist Trophy, Eifelrennen and the Swedish Grand Prix - the 300 SLR won them all.
you might recognize the 722... it was given it's own very special and unique transporter. The Rennsporter
Initiated by Mercedes-Benz race manager Alfred Neubauer, who wanted a fast option of getting race cars to the circuit or back to the factory if necessary, the Prototype-Department created a hybrid between a sports car and a truck. http://justacarguy.blogspot.com/2007/06/one-unique-vehicle-transporter-of.html I recall reading that it had the same engine as the race car