I am really surprised this didn't kick up

ir3333 said
Lots of experience talking here.Wonder how many guys have welded as an occupation...and how many have picked up one end of a long piece of square tubing?Mild steel is soft and Even 10 gauge will bend quite easily.The design or geometry is very important and as i stated earlier a triangle or gusset can be very strong.
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You do realize a subframe connector is about 4 foot long right? Are you comparing a 12 ft long span of box steel to a 4ft span. If so the 4 ft span will flex a whole hell of a lot less. I dont believe any of us said subframe connectors completely eliminate flex. It severely limits it.