Not sure what a rolling chassis weighs.
Our best scrap price in my area is $11/100 lbs.
Based on title, an entire 1/2 ton truck could weigh around 3,200 lbs. or so. You can do the math...
There's an Ebay seller who has a 54-55 1/2 ton frame only, for $550. I'm watching in interest to see if he sells it.
I bought a '58 headed to scrap from a buddy for parts for my '59 for $300. I've sold 17 excess parts off it and it's already paid for itself. I still have oodles of extra parts including engine/tranny and I'll still get close to $300 when I finally send it to the scrap yard.
Basically, if a person wants the frame he'll pay for it... or he could find a truck headed to scrap for the best deal.
Jerry