Actually, the inner bogies touch before the outer ones. The inner ones are slightly farther back, and as the aircraft flares, the back ones naturally touch first. There are some pics on this site of aircraft flaring or rotating where the inner bogies are on the ground and the outer ones are in the tilted position.
"Bangkok Tower, United 890 Heavy. Bangkok Tower, United 890 Heavy.....Okay, fine, we'll just turn 190 and Visual Our Way