The 787 is said to be limited by the present under carriage to a TOW of ~254t. An analysis of the structure by Lissys puts the weight of the present undercarriage at ~8.6t or ~ 3.8% of MTOW. In the absence of such things as ACAP documents we don't know what the pavement loadings are and by inference the tire loadings. I would assume that the existing "hardware" could be strengthened with a modest increase in weight . My question is what is possible with the tires? Presently there appears to be plenty of daylight /space between the main strut and the tire for additional width. I would assume that with a wider cross section tire the present pavement loading could be held but could the tire be redesigned to carry more weight?