Actually if he uses wheels with the appropriate offset to compensate for the spacer thickness the bearing will have exactly the same lever arm as without. The 'torque' arm consists of a straight line between the force points - center of contact patch to wheel bearing - regardless of what the actual member is shaped like.
Wheel weight itself has very little - uh - bearing on bearing loading. It is the vehicle weight and cornering loads that generate the vast majority of the bearing loads (unless you jump things - then landing wins out on worst loading condition...)
[/b]
Correct, except that liftoff might be worse than landing...