I was getting off the old class 1 hitch that has been on my jeep since I got it last year. The bad news, I snapped off the 2 lower bumper bolts due to them being rusted to hell. The good news is that there's something to grab onto, as the bolts were going through both the hitch and bumper. How do I go about getting these out? I bought a set of Erwin bolt extractors and left-hand-threaded drill bits, but I hear that extractors should be your last resort, as if they snap off you're really up the creek. I have a mapp gas torch, however it's RIGHT next to the gas tank so I'm iffy about using an open flame. The same situation with welding a nut onto them, I have access to a MIG welder but I'm worried about the gas tank.
I've been soaking them in 50/50 ATF/mineral spirits and liquid wrench rust penetrator for the last week, so hopefully they're loosened up a bit.

Anyone have any ideas before I'm force to break out the extractors?

As long as your gas tank does not have any leaks and there are no gas fumes, flame and welding should be ok.

If you do any welding, be sure to disconnect your battery to help protect ECU and other electronics from surge.

Thanks! that gives me some comfort about being around that area with fire/a welder. I'm gonna give it another go tomorrow.

Weld it with a full talk of gas too. Makes it safer

Update for anyone wishing to reference this thread:

I tried welding a nut to each of them, however there wasn't enough room for a good enough weld(as far as my skills were concerned) everything i tried to weld on, twisted right off. Heating them up then a pair of vice grips proved fruitless. I finally drilled it out to the biggest bit i had, and stripped out the 2 largest extractors in my kit. Nothing worked. I ended up cutting holes in my cross member so i could cut out the welded-in nuts with a sawzall and weld in new ones. Although when i moved to the passenger side, after i cut the nut and bolt across with the sawzall, i was finishing off the rest with the air chisel and what was left of the bolt vibrated out. So given some more work, i probably could have done the passenger side without cutting the cross member. However, i look it as now i have access to the rear of my frame rails for drainage/rust treatment.