I’ll try to sum up the issues of why you shouldn’t put wider than recommended on the rims....
The wider you go the more you move the contour of the bead inward at its base ... easier for the bead to come unseated when stressed in say a hard turn
Also you have more movement of the tire ... not enough lateral stiffness and the tire will feel like it’s rolling over it self ... however stronger sidewall tires like truck tires are ‘stiffer’ and do not move as much as passenger tires would
And lastly a smaller rim ‘balloons’ the tire and you do not have good contact ...
These issues are marginal as we can live with a smaller contact area or run a lower pressure... and the tires being truck tires are stiffer and ‘roll’ less than a passenger tire ... and... we no longer have a 33x9.5 ... soooooo we are stuck with 10.5