always have the mindset of 2wd gets you there, 4wd gets you home.
Kinda answers your question here:
http://forum.expeditionportal.com/threads/173562-How-far-can-you-get-with-a-2WD-and-a-shovel/page2
^^THIS^^
When I do the mods to my Avalanche and/or kit - they fall into one of (or ideally multiple) the following categories: Capability, Reliability, Recoverability, Survivability.
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Capability - What allows me to go places I couldn't go before but want to go to - and expand the envelope so that I am operating more in the midrange rather than at the extreme edge of what my vehicle can do. Or allows me to do so for longer durations and distances.
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Reliability - What decreases the risk of breakdown or damage
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Recoverability - If I get in over my head, what allows me to self recover (we do a lot of solo stuff)
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Survivability - In the event of emergency, terminal breakdown or inability to self-recover - ability to communicate (globally), survive, and (if need be) hike for up to the planned trip length plus 3 days.
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I guess one of my points is that being remote with a vehicle that really isn't designed for - or modified - for the purpose, then there should be more of an emphasis on those last three areas. My $.02, and I expect some change.
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I guess I would fall into that class of folks who have stuff on their vehicle: winch, Hi-Lift, Max Trax, Rotopax, etc. But, there is a LOT of money spent on things you don't see: gears, tie-rods, steering components, aftermarket trans and converter, oil coolers, etc. Whatever vehicle you choose to use (I look down on no one as to what they drive) it is wise to understand the weakpoints and address them in a planned out manner at home rather than in a crisis in the middle of nowhere. Even then, stuff still can and does happen. Most importantly - have fun!!!