Offset quadrant shower trays are for those who want a quadrant shower enclosure and tray but with a bit of added space. Shop Offset Quadrant Shower Trays at Bathroom Shop UK. Offset quadrant shower trays are extended versions of quadrant trays, featuring an extended width that allows for a more spacious cubicle. Stone resin shower trays are fast becoming the most popular choice. An offset quadrant shower tray is an alternative tray shape to whats normally available making a visual statement in your bathroom.