[57taskforce]

Makes perfect sense actually because the K5 and short K10 use basically the same frame (obviously wheel base and cab mount quantity and spacing are different) but the frames are the same thickness. The long K10 and K20 use the same identical beefier frame, only axles and springs are different. I bet with the thinner frame gauge of the K5 and short K10 it necessitated the brace. (all the K trucks should have had it in my opinion)