1500 155 rounds on one truck? How much does one of those puppies weigh?
Maybe 90 pounds? (If the link info is correct)
"Since these rounds are not rocket propelled like most mortars, bag charges would be tossed in the tube and the two men would use a special carrier to hoist up and drop a 90-pound 155mm munition, or it may be breech-loaded like the 160mm mortars used by Russia, Finland, and Israel."
I also found it to be a high number of shells for one truck. If one weighs 100lbs (and I am sure they are more) that's 150,000 lbs, or 75 tons. Our tanks weigh around 60 tons, so I suppose it's possible to have that much ordnance in a large semi. If there are that many shells, do any of them contain sarin? That's the real question, since we know they've shown up there before.
If they were assembled with propellent and case, about 60#, if I recall correctly..Been a long time. :-(
Even then, 150 rounds off the street is great news, too.