PB Blaster. Spray it on liberally and hammer the bolts lightly to encourage it to get down in there. Keep doing that over and over for a day or two and then give it a go. They can be really tough to get out, so be prepared.
Well I tried every method you guys gave me had very good success. I removed all six with none broken or stripped. I did have 1 stubborn one, Talked to a old timer He gave me some advice I tried and I thought I would share it. He suggested to spray with pb blast and then heat with a propane torch, Repeat until you suceed. It took me a couple times. I tried it one time at night no sucess sprayed it went to bed and in the morning did it again a couple times and bolt came out. Very slow going but better than a broken bolt or striped nut.