How much weight can a set of four bed risers actually hold?

Stated per-set capacities in this category run from about 1,300 lbs (most plastic adjustable sets like Utopia Bedding and Home It) up to a marketing claim of 6,000–6,500 lbs on oversized HANIHUA/MYMULIKE models. r/Mattress and r/DIY threads repeatedly caution that real-world capacity also depends on slat support and how evenly the bed frame distributes weight, two adults plus a heavy mattress can exceed the rating on bargain risers.