A gas spring and gas damper assembly includes a gas spring assembly and a gas damper assembly. The gas spring assembly includes a first wall portion, a second wall portion disposed in spaced relation to the first wall portion, and a flexible wall section connected therebetween. The gas damper assembly includes a third wall portion disposed in longitudinally-spaced relation to the first wall portion, and a second flexible wall section connected between the second wall portion and the third wall portion. A fourth wall portion is disposed between the first and second wall sections to define two pressurized gas chambers. A damper rod connects at least the first and third wall portions. Methods are also included.