As to the auto cut-off. My wife drives a Prius and it's infamous for causing this same behavior in SOME pumps, and it is pump specific. Some do it, some don't. Usually the fault is with the pump, it's simply set to be too sensitive. However some cars (the Prius and I've heard this from other JGC owners too now) are more likely to have it happen.
The solution I've found is to (do not laugh, it genuinely works, I've done it MANY times in the Prius) turn the nozzle upside down while filling. For some reason it makes the auto shut-off less sensitive. It still works, still shuts off when it should, but allows me to fill the tank without swearing and scaring away small children. Looks a little goofy, but I don't care, it works and it's better than shutting down the pump and trying another one 'til you get one that's less sensitive.
Having said that, if ALL pumps are misbehaving, and the upside down method doesn't work, then there may be something going on with your Jeep.
What I wanna know is...who was the first to figure out the upside down thing? It's certainly not the first thing I thought of when experiencing this problem!!