I found this info on a Wikipidia site. Has anyone ever seen or heard of these?

1955 - 1959 - "Task Force"
Production 1955-1959
Body style(s) 2-door wagon
Layout FR layout
Engine(s) 265 cu in V8
283 cu in V8
Engines included I-6 and the small block V-8s. Chevrolet used its 265 V-8 engine, later evolving it to a 283-cubic-inch version. GMC based their V-8 on a Pontiac design. Standard Suburban model numbers continued from the previous series, but the introduction of four-wheel-drive models in 1957 added the numbers "3156" for 4WD Suburbans with panel doors, and "3166" for 4WD Suburbans with tailgates.