Low profile tyres,usually P rated, definitely are not safe on dirt roads.
That BFG 265/65/18,in todays world, wouldn't be called low profile.
Its an LT tyre with a very high load rating,a heavy duty off road tyre,thats why they would be using them.
Even the BFG 265/60/18 is also a heavy duty high load rated off road tyre,not really a low profile tyre for high speed on road use.

