If you are talking factory check to see if stamped on wheel. Probably on back side. I also think they are listed in owner manual or shop manual. I remember seeing but don't recall where.
Stock/standard rims weighed 36 lbs each and weight capacity 3200 lbs (+or-)a few.
I recently put on aluminum wheels 26 lbs each with 3000 lb weight capacity. They had -3 insert.
The farther the rims/wheels allow the tire to stick out from beneath the wheel well the less weight capacity they have.
I would think your wheels would be similar to my stock wheel in weight capacity but not in looks. Your's would have been nicer.
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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000