Food for thought....and I am a 4wd advocate and this is a 4x4 website...
4wd adds $3k to the price of a new suburban - quick configurator check. If the driveway forces you to buy 4wd vehicles and no other use "requires" them....how much would you save over your lifetime by asphalting the driveway
Shooting from the hip here, with no real data, but RESALE value of same suburban is $3k higher than 2wd version, so it costs you nothing?