The less you can weld to the top section or rails, the flatter the top surface will stay. The thicker the material the more you can weld to the actual structure without it pulling or moving.
You will never have 4000 lbs on your chassis table unless you add everything to the chassis table for mock up. Dynamat, glass, and interior parts. The chassis table is just used to get the parts to a roller in the fab process typically.
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