When can I use '4H' in my new 4X4?

Using 4H to increase stability and traction. What are the consequences if you get this wrong?

Specifically, a viewer asked if it's OK to use 4H on wet main roads, or unsealed roads. Essentially, I don't think it is, because it will increase driveline wear, and in extreme situations it might break something expensive, and also leave you stranded.

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