The GVWR with front/rear axle and tires is listed on the Serial # plaque.
This has been standard for years.
Its located on the centerstand mount for the Downtown.
Subtract the weight of the bike (4xx lbs) from the GVWR 768 lbs.
The 4xx should take into account all fluids and what stuff you have added.
Ie , 768 - 411 = 357 lbs carrying capacity.