They may have made a change. I know a lot of manufacturers had very low weights, like 100 lbs. or less and sadly, with the obesity problem in the US, not a lot of even younger kids are that light
and gee by 12 years old, I wasn't either! I contacted Parkliner
last week about what their bunk will hold and they said 250 lbs. also (25 x 80). I cannot tell you how many used units over the years with bunks that we have seen where the top one had ripped loose from the wall. Hopefully, all manufacturers will "beef" up the bunks!