I toured for 6 months with a lot of weight.. on solid low rider racks, Bruce Gordon's,
and solidly mounted bags, with the contents packed so as to not move, at all in those bags..

It is the predictability , that helps..

There is a long running discussion on Porteur racks , rigidly mounted large platform racks
and how more fork offset in the front end, lower trail, is better ..

Porteurs were the delivery people who rode fast thru the streets of the French Cities,
shuttling the new editions of the newspapers from the publishers
to the Kiosk vendors. to get them on the streets ASAP.