"Sleeper" -- On many old medium duty trucks you will find heavy timbers U-clamped to the frame rails, they would run parallel with the rail on top. Then the bed, box, platform would be built on those timbers. I don't know if that is the correct conventional terminology for what I was calling "sleepers."
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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