In ground weighbridge?
Entirley feasible I am assured. In Australia there exist 400 tonne weighbridges to weigh giant mining trucks.
It is only a question of getting our heads around the concept of weighing and checking the bal;ance of the whole plane in one pass over the inground eighbridge just before take off and just after landing.
Why after landing? To weigh intruders form outside the country that has the new system.
Simple, like all great ideas. As my instructor used to say. Keep it simple stupid and I can undrstand it.