Kinda academic but simplified as -
The golden rule of trike design: optimum stability of a tadpole trike with two wheels on the front axle, the center of gravity (center of mass) must be a third of the wheelbase back from the front axle, or achieve a static vertical load of three equal loads of the weight on each wheel; optimally equal to 66% on the front axle and 33% on the rear.
https://www.deferredprocrastination....-trike-design/