Depends on so many variables and personal preferences....12” or 14” rim? Need DOT rating? Riding in mud and/or public roads? Extending swing arm to permit wider tire selection? Concerned about top speed and rotational mass? Noise? Vibration and stability at speed on the road? Service life? Directional or non-directional tire so it can be reversed following wear? Square or rounded profile?
For example just for a 12” rim you can get a ~14 lb sand tire or a 22lb mud tire with lots of choices of weights, tread depth and tread patterns in between.