If you think of the axle as suspended by the shock...and raise one tire...it lowers the other tire...like a see saw....so the shock doesn't even need to change length, and the tire can travel up, or down.
If I droop BOTH tires straight down...so I am at maximum straight droop...and then STUFF one tire...the OTHER tire will droop EVEN FURTHER.
And, the Drooped side shock will get SHORTER.

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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif