The shorter the center of gravity, the better right?

When towing boats and trailers, the general rule is 10% of the weight onto the hitch for stability and other reasons. Is there a similar rule-of-thumb for truck campers in a truck bed?

My 9'6" NL in a long bed F350 SRW puts about 10% on the front axle, and 90% on the rear axle. I'm at 88% capacity of front axle rating, and 95% rear axle rating.

--tg