Factory skids leave out the tranny skid (some '05 have em). You can get it for under $30 though, easy install. Do a search and see what you can find.
Rock rails are very important because you'll go over that big rock with your front tire and as soon as the front decends off it your side will be be dragging on that rock, without protection this isn't good, but with the sliders you slid right through and your rear tire goes right over.
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2004 Silver Liberty Sport 4x4 (gone)
1996 Land Rover Disco I
L.O.S.T #000522 Life Time #JH053535