If it's muddin' you're doin' then I would say to get a beater rig. Our alternators hang pretty low in our engine bays and have been known to fry themselves when subjected to a muddy water bath. And if you're going all out in the mud, it's hard to "pick a good line" since you'll probably barely be able to see where you're going any way. That's my two cents.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless