I have soaked it for days with penetrant and am using an impact driver. Am I going to need to bring it to someone with a pneumatic impact gun? 93 LWB if it matters

 

I had to do mine a while back and I think I ended up using my HI-Lift jack handle over a ratchet and probably thrashed the ratchet in the process.

 

I used the impact driver and it worked fine. Is the blade tip wide enough for the head of the bolt? I tried a couple of blade sizes and the widest one worked the best. I know what you're feeling....I was scared when I had all but one off...I was thinking of the worst.

Anyway, good luck. I guess you could drill the bolt out or even use a reverse thread screw extractor. Every garage should have a screw extractor set, they're priceless.

-Steve