I am also a pilot (ATP), I also have some experience with sail boat design, where centers of forces are equally important. I also know that weight distribution on performance cars has a direct impact on handling. So, aside from the risk of overloading the front axle, I would also think that rear axle placement has a direct impact on handling characteristics. Now I know that we don't do .9G turns with our recreational vehicles, but discovering that you have an inordinate amount of over/under steer, or to have the tail snap out when you suddenly try to avoid that moose in the road would be a rude awakening, to say the least. You will also be looking at affecting the load and wear of tires. All in all if it were me I would do a careful analysis of cg and place the rear axle as accurately as possible to achieve a desired weight distribution.
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