U-Boats have been placed under floors supporting quite a bit of weight. However, testing for compressive tolerances is expensive and to keep U-Boat costs down, we have never verified performance."
What are "comprehensive tolerances"?
I understand the expense. At a minimum you would need a dial caliper and use of some weights.That is close to $50 for the caliper and guest passes at the local gym for 2. Around here that is a Chinese food dinner for three!