You tried to support a body on a 4x4 in the middle of a piece of 1/2 particle board. The saw horse didn't really fail, it had too much load over too small an area. If you had a 2x6 on top of that particle board to spread the load out to the steel it'd probably still be holding, but certainly not stable.
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'04 GTO Yellow Jacket, A4, Kooks, CAI, etc.
'02 Firebird, V6, auto
'68 GTO Convertible, HO, 4spd, driver
'66 LeMans Hardtop, 400, FI, A/C, 4L80E.
'65 GTO Hardtop, next project
'64 GTO Hardtop, "389", Tri-power, 5 speed, A/C, Yorktown Blue.
http://www.gtoaco.com
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