Yeah, thinking you'll end up with a nasty mess if you're using alum pans in the cambro - do you have a rest supply store near you? 2" hotels are pretty cheap and hold an impressive amount of pulled meat or beans...
Also - 140lbs of pulled pork - is that precook weight?? If so, that's still alot of food, even for marines!
140lbs - 50% fat/water loss = 70lbs cooked weight (it's usually closer to 40% loss, not 50, but we can error on the side of caution) - 70lbs cooked x 4 (1/4lb servings) = 280 portions! By my calcs you'd prolly be closer to 50-55lbs cooked weight... 55lbs would give you 160 1/3lb servings.
Hope it goes well for you!