How much weight does this bed hold?

Tonight, we had the Arnett kids join us for a few hours while Clay & Carey went out to celebrate their 11 year anniversary. They will return the favor for us next month on our anniversary. We do this every year and always look forward to a night out without having to pay for a sitter! (plus, the kids always love it) Clay, however, said the deal was off if we kept having more kids! HA