I just noticed the hydraulic struts on the lower tailgate on our X5. Is the tailgate supposed to go down slowly on our X's?

A friend has an 07 Tundra, and I noticed that his tailgate goes down slowly because of a 1 way strut connected to it. I now wonder if my X5 should have the same thing, and my struts happen to be worn out.

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01 X5 4.4 (sold), 99 Toyota Land Cruiser, 08 Ram 1500 Quad cab 4wd 6-Speed Manual, 06 Prius, 12 Camry SE.

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