A seat assembly for an emergency vehicle can include an adjustable base seat and backrest, a tank support assembly configured to selectively secure tanks of different sizes, and a tank clamp assembly configured to selectively secure tanks having bottom tank ends of different configurations. Slidably adjusting the base seat can cause adjustment of a recline angle of the backrest. One or more pads on the seat can be removable. The tank support assembly can include first and second tank securements and a locking member configured to rotate to selectively dispose the first or second tank securement to secure a tank. The tank clamp assembly can include a fixed foot clamp, a movable foot clamp, and an adjustment device configured to slide the movable foot clamp to selectively clamp the bottom tank ends of different sizes between the movable foot clamp and the fixed foot clamp.