Most of the pics of the B-52s seem to show that the outer front wheelset is turned sharper than the inner one, (toe-in) therefore creating quite a bit of tire-scrubbing and the wheelsets working against each other.
Photo © Gerhard Plomitzer
Photo © Stuart Haigh - topjetpix
Photo © Mark McEwan
Photo © Rez Manzoori - FlightLineImages
Photo © John Powell