dssur
+1y
that'd be tough given how long the rear trailing arms are.. you'd have to cut the frame in front of them.
aside from that, I say just take the wheelbase of the longbed, subtract the wheelbase of the shortbed, and cut that much out of the frame where is nice and flat. I saw an article in Truckin a long time ago about shortening a BED, but I've never seen a frame article, it would be interesting to see. If you find it let me know.