... Coaches have a nasty habit, when stuck in mud or soft ground to sink straight down till they are resting on the body, suspension beams, and engine....
Forget the winch or the wench or the jeep just do this http://www.funniestvideosonline.com/video.php?video=2349&How_to_Unstuck_a_Tractor_from_the_MudMelbo
A 12,000 winch is not much most Jeeps with a front winch are 12,000 lbs I was told by a wrecker service to X the weight by 2 and that was the size winch and truck they sent, the 12,000 lbs is line pull