Rears were like 63# fronts 61# and dimensions are your tires (28"x12"?) but depends on your packaging. Mine are in garage staring at me but I'm going by memory above, can recheck for you.
Google shipping wheels tires there was a BMW forum thread if I remember, shipped a few that way with success, good luck.
-J
Was out in garage packing up the destroyed wrappings and the rear wheel/tire was 60.4# and fronts 58.4# and rear tire alone 26.4#
Dimensions roughly 27.5x12 rear 27x11.5 front
All with highly accurate bathroom scale and tape measure/eyeball.
-J