If you have a helper (and a largely unrusted bus) the easiest way is to have one person on the bottom putting a vice grips on each nut and a person inside loosening the bolt with an impact driver - or even just some wrenches. I had to cut most of my bolts off because of rust, but I did remove two of the seats with a vice grips on the nuts underneath; I used an ordinary wrench and a hammer to get the bolt started, and then a ratchet wrench to undo it fully. Power tools are great but not even strictly necessary for this job.
If you have to cut any bolts away, I found the easiest way was to use a cutting wheel to cut down through the bolt head three times, dividing it into six wedges and then nibbling them away, then using a grinding disc to remove the rest of the material.
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