285/70R19.5
the service trucks run them, and they ride like hay wagons. even when the trucks are log loaded at 19.5 and 20K pounds. a speed bump, crushes vertebrae, pot holes and unforseen obstacles are jarring.
but they wear like iron, have puncture resistant sidewalls, are reasonably good off pavement, and kinda quiet.
my personal rig is a dually seeing very little action anymore she is, like me, old, an is my transportation and my companion in a way. i have begun to used d rate tires out back, cheaper, and might be just a bit softer riding. my go to had been the m55 toyo. no longer.
front footprint: a single larger rim. if you have duals in back, a single non dual offset wheel up front you can play with offset for tracking and tire print. this assumes the dually adapters are removable on the new truck axles like they are on the older rigs.
aesthetically the standard single front / dual rear i appealing.