Right here goes guys, hopefully this helps, its a direct qoute from a book titled "Fighting Techniques of a Panzer Grenadier".
"The SDKfz251 drivers were prepared to simply ignore or drive through small arms fire, but the
presence of enemy artillery or AT guns usually forced the halftracks to seek cover.The squads machine gunners might well engage targets on the move,as could the rest of the squad if necessary from the sides of the vehicle. Often when advancing, the SDkfz251 could utilise a motorised version of fire and movement, advancing, stopping and firing to cover the other halftracks. A halted halftrack provided a decent fire platform but was extremely vulnerable. As a result, it was not recommended to stop for more than 15-20 seconds in hostile terrain. The normal dismounting procedure was through the rear of the vehicle. However in emergencies, the squad might well jump over the sides. This was often performed on the move at slow speeds"
The book does go on to say though, that after the initial few months of Barbarossa "due to the heavy losses suffered amongst the halftracks when accompanying tanks into the heart of battle, the Germans quickly resorted to de-bussing at least 400m or so in front of enemy positions"
Hope this helps people out !
cheers