I have posted this pic before but it is worth looking at again in the light of dragartist's comments about vertical c of g of the load etc.
The 'war load' MSPs were even worse as you could hardly see the main load for the wall of jerry cans ammo boxes and the like.
A problem when dropping double MSP loads was that the speed of the first load out would often cause the HD rollers at the rear to jam. The following load would then cut flats in the jammed rollers as it passed over them ! More work for the overworked role equippers.