Steve,
Balanced and imbalanced forces are different things. The aircraft was made to be put on three wheels at the ground angle. By placing the fuselage in that way extra force is being centred on the top rear of the fuselage(it stays balanced but by a different means).
In flight again, forces are balanced and the strength is in place to deal with the forces of lift and to a greater extent, turbulence and air movement. Yes both lifting surfaces do create lift, the whole point of the tail surface is to resist the pitching moment of the main plane. so tail lift(as a moment) is often inversely proportional to main plane lift. Besides providing a lateral stabilising factor the rear fuselage need ideally only deal with the maximum possible turning force created by the tailplane multiplied by a safety factor. And that force is often an instantaneous one, decreasing with aircraft movement.
I hope that goes some way to explain why its just not a good idea to do this……
coanda
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