Buckshot: Absolutely agree, and was my intent when I suggested the idea.
Semp: Definitely a possibility, so you'd have to be careful where you dropped the supplies. In fact, I'd suggest the goons would have to land and taxi to the center of where the FOB would deploy. Even then, there's certainly the possibility that you may end up with a clump of trees or a hedgerow in the middle of your runway. Not necessarily a problem, as you could always land nearby and then taxi onto the marston mat before exiting your A/C (to avoid a "ditch"). I'd also suggest that the arena code would need to have some parameters defined on the terrain conditions necessary to successfully deploy your FOB, such as the relative flatness required.