You mention in your bio it's a turf special, unfortunately I can't find my turf special info with the exact weight with turf tires but I have it with ag tires. With 6.50-16 F2 front and 14.9-28 R1's on rear it weighs 3749 lbs. or 1700 kg.
One way to figure the turf special weight is to subtract the weight of the standard tires and rims (624 lbs) and add the weight of the turfs and rims with 29x 12.50-15 NHS front and 21.5L-16.1 R3 rear (358 lbs) making the turf special weighing about 3483 lbs. I got the tire and rim weights from 1996 Kubota Price Book.
For comparison, I do have the published weight of the older M4030SU-TF which is a heavier tractor than the newer M's so it weighs in at 3946 lbs in turf special trim. Hope this helps.
I think you can make a educated guess now as to which trailer you need.
Kub