OK, as an engineer, I am struggling to understand how winglets would make any difference to the loading on this fork?
My thinking is this, the plane's body mass has to be supported by the wings, makes no odds if the wings are bigger/smaller or more/less efficient, they still have to hold up the same mass.
Watch the winglets bounce around the next time you fly, then watch wings without them....cyclical loading with the extra mass at the end of the moment arm.
Source: leeham
https://leehamnews.com/2019/10/08/bo...pickle-part-2/