Chevy s10 cab removal

O.K. I'm stumped. The nuts on the mounts don't seem to want to loosen. Is the stud a bolt with no access? Do I break out the torch or sawzall? Help!!!
Thanks all, -stick

 

They are threaded plates in the cab floor.I would just cut the bolts.

 

In the past I've figured out where the captured nuts are on the top side and took a die grinder and cut out an opening in the top of the floor. Then you can heat the nuts up and back out the bolts. If you used 1/64" wide cutoff wheels, you can weld the pieces you cut out back in. Make sure you use plenty of never seize or grease on the bolt threads when you re***emble, in case you ever want to get them off again.