Only downside to having an electric winch sitting on the front exposed to the elements, not being used, is it still needs to be serviced. Moisture from river crossings, rain etc. can still get in.
If you are going down the road of 'in an emergency', have you considered a Tirfor style winch? man powered, it can be thrown in the back of the 4WD out of the way, out of sight of those with light fingers. Plus side is you can use it in any direction from your 4Wd as long as you have somewhere solid to attach it to. Use it on a mates truck, use it to lift that big red deer into a tree for butchering....
Downside is it is man powered, so take a mate.
Tirfor Hand Winch & Snig Chain | Trade Me
TIRFOR hand winch. | Trade Me
Another option is a Hi Lift jack and a winch chain kit.
4WDbits 5 Meter Hand Winch Kit - Complete - with 60 inch Hi-Lift Jack
Bookmarks