I haven't done any homework to know how rare these are but... There is a Buick Truck listed for sale on the Denver,Co Craigslist in the Buick Parts section. I'll know more by the end of the day about Buick Trucks.
http://denver.craigslist.org/pts/1975018851.html This guy says he is looking for this truck which was listed on there in 2009.
The bed in that picture is more like a mid 60's bed. Not the style of 50's at all. I would bet that any 50's Buick truck you find was a built car. I think they quit making trucks before the war, like about the time of the stock market crash. Someone will correct me if I'm wrong.
I beleive the last Buick TRUCK built (not an SUV) was in the early part of the last century ... like 90 or a 100 years ago or so, but Buick did make a TRUCK.
