Two interesting tales from AA62 and gopher -
On an ABEX the heavy drop either used an adjacent Dz to the troops or went in first
One of the (few) advantages of the Bev was the ability to do a combined drop. 2 MSPs down below and 30 troops in the boom and drop them on one run. By the time one added in all the safety margins you needed a bloody big DZ and the paras inevitably had a long hike to get to their vehicles.