There should be a prop rod on the right side (US passenger side) that pulls away from a clip in the bottom of the rolling floor and then the tip of it rests in a little cup like place near the roller at the tailgate.

Mike

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Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic