Takes good helmsmanship plus good crew work to hold a boat stable at large heel angles like that. Of course you'd never get an ice boat to even 45 degrees - you'd lose all control. The runners are sharpened to a 90 degree Vee, so at 45 degrees of heel you have flat surfaces against the ice. I'd think the big issue with Boss would be keeping at least one rudder in the water, otherwise the helmsman can just go down for a cold one and watch from the companionway.