Perro,
There were only 1/2 ton suburbans during A-D Advance-Design years (47-55). All A-D 1/2 ton trucks came in one wheel-base (116").
As you stated, there are different body mounts on the 1/2 ton panel-body frames (plus a few extra reinforcement "gussets").
Also, the 1/2 ton frames were different in different years. 1954/55 frames were different from earlier years but the differences might not be important, except for the lack of brackets for panel-body mounting blocks. Also, 1953 and earlier 1/2 ton frames had an extra frame cross-member for the mount at the rear of the transmission.
What year frame and/or body are you looking to put together?
Here is a direct link to GM Heritage Center resources by year. 
