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Some trucks (early? bigger trucks?) had the horn mounted in front of the radiator, pointed down. This is the standard Base Model F-1 horn. It's on the righthand side here, RHD trucks may be opposite?
isn't that a 51+ horn.. in 48 they had the small snail as the standard and the Twin Hi-Way horns (super rare) as the option. (pic back on my martin's supply page for the twins)
well in junkyard crawls I've seen a few (maybe 3 or 4) Kansas City trucks with 6 cyl motors mounted exactly like the picture above. All of the 8's either had no horns, no motors, or snails under the front apron. my (6 cyl KC truck) had 1 snail mounted under the left side of the front apron (right next to the park light).
chuck (chuck's truck) is pretty much an expert in the 48-50's and he indicates that even the twin hi ways were under the front apron - let us know what trends you find if you would.