FarmWrench, my door weighs about 6000 lbs just the portion that hinges, not including the framework to hold it up, we used 8-1.25 inch pins to hinge it, as for fluttering in the wind, we don't open it fully up when the wind is over 25 mph, anything less than that doesn't effect it much if at all.
As for plowing in tile I don't, I dig everything in with a bucket wheel trencher, anything over basketball size we end up lifting the wheel out and using an excavator to dig them out, for two reasons, the first being they lock under the wheel if the wheel can dig them loose and second most times the wheel won't bring them up out of the ground, depending on the moisture and how hard the ground is, the dryer and harder the digging the less likely the wheel can jar them loose enough to bring them up. But that depends some on what type of rocks they are. I deal mainly with limestone and some granite and shale, the really granite prone area's I tend to avoid as much as possible, I'm busy enough the way it is, no need to slow progress from a slow walk to a standstill.