Yes you can extend the whole slide that contains the bed/hallway closet and W/D without extending the bed slide itself. The main slide needs 26". Still have room to walk around end of bed and get to front closet or open drawers on dresser. Having bought this exact coach, we cannot extend the S/S portion as it sits next to garage.
The switch to extend main slide is housed w/ the other switch for rear 2 slides on control panel. The S/S switch is in bedroom above the door nightstand which I think is a good idea so you don't/can't extend the S/S by accident if it was with the other 2 switches. 1 drawback is entry to the bathroom w/ slide in if need to use while on the road. Was told you can extend it a lil, but have to be careful w/ gaskets as they may not be in right position to keep things tight if ran out a lil too far. If so, have to fully extend the slide just to get gaskets back in "right" position. Other than that hic-cup, we love this coach.