After a kind person helped me with translation
Its been narrowed down to
Helmut Köllner was a driver of a semi-tracked armored personnel carrier Sd.Kfz. 251 in 5th Co. of Panzergrenadier-Regiment 6 as regimental part of 7th Tank Division (during the war in the West 1940 the CiC of this Division was Erwin Rommel).
Also his death letter was signed by Oberleutnant Hansel. Im hoping someone can help with any info on the above