The worst thing I've ever seen was someone who took a mint '68 Firebird and stuck it on a truck frame with about 16" of lift. Tragedy for 4x4, tragedy for the greatest muscle car ever.
Given the relative amount of space in the back of a K5 without the rear seat, why not try to redesign the rear area to incorporate a 37" LCD tv, a 5.1 surround system, an X360, and a chopped down and reupholstered rear seat mounted backwards? Definitely a show truck idea there, but none of this stupid 4" screens mounted everywhere - it'd be functional.
I'd imagine with a Suburban without the rear seats, done like above, you could make a 42" look pretty good in there.