The Steyr, Mercedes and Phanomen Granit L1500A replaced the heavy uniform personnel vehicles, according to Reinhard Frank. These vevhicles held eight men, including the driver. Two vehicles transported a squad.
As a general rule, 3 out of 4 panzergrenadier battalions in a Panzer division were motorised, only one was armoured. There were exceptions such as Panzer Lehr.
I have a number of Panzer division histories, which sheds some light on the subject. 24th Panzer rebuilt early 1943,after destruction in Stalingrad, had 3 battalions equiped with Opel Allrad, and 1 armoured battalion. Also 4 Panzer had 1 battalion equipped with Steyrs and 2 with Opel 2x2 and 1 armoured. In 1941, 19 Panzer had all 4 battalions equipped with a variety of trucks. the division received Sdkfz 251 D's in 1944.