What is the steepest angle of rock slab that a 4x4 suv or truck could...

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DrShrinker

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...theoretically climb? Like a Land Rover or Hummer, for example. Without a winch or any means of support other than it's own 4 wheels, before it's CG would make it tip over backwards? Assume that is has plenty of power and power is not the limiting factor. I was arguing with a guy who said that several vehicles can climb a sustained 70 degree (not percent) rock slope with the right tires. I say the steepest is around 45 degrees.

What makes sense to you physics folks?
 
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