An accessory mounting system comprises a vertically aligned bracket configured to mate with a top corner block and a bottom corner block disposed below the top corner block of a pre-configured shipping container. A shaft may mount to the vertically aligned bracket and may have a first section slidable into a second section. In some examples, an accessory may be coupled to the shaft. The accessory may be elevated above a top plane of the pre-configured shipping container when the first section is slid at least partially out of the second section and the accessory mounting system is in an extended position. The accessory may be disposed next to the pre-configured shipping container when the first section is slid at least partially into the second section and the accessory mounting system is in a retracted position.