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It really depends on how heavily loaded I am, and how bad the corrugations are (i.e. what speed I can maintain)
With my camper on the back (i.e. at max weight), on the road I'll be at 80psi rear, 65psi front, but if the gravel road I'm travelling won't see me going over 70kmh, I'll drop it to 50-60 rear and 40 front. The slower the speed, the lower I'm willing to go. If it is sandy, I have gone down to 23 in the rear and 15 front. If I'm unloaded I'll start at 60psi all round and go lower.