The availability of stainless steel (bright metal) door-window trim options (SS reveal for side door windows) might have been different on New Design GMC trucks (47-55). The Chevrolet Truck Data Books indicate that bright metal side door window reveal was not available in 49 and 50 on Chevrolet Suburbans and Canopy Express.

That also seems to be the case in 1954/55 for Chevrolet Suburbans. RPO 390 Deluxe Equipment and RPO 393 Chrome Equipment did not include bright side window reveals for Suburbans (but the Suburban 390G did include bright front window, ventipane, and rear window reveals).

Ter's question was:
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Was stainless outside window trim on the two side back windows of an AD suburban available? I have seen pictures of burbs that have bright trim on those windows but never seen one in the 'flesh'.
So, the rear door windows on a Chevrolet Suburban might have had stainless trim around them but none of the Chevrolet Suburban side windows would have had stainless trim/moldings. It looks like the rear window stainless (on rear doors) was not availble on Panel Trucks (maybe someone has better information on this).