Bagman, I agree with rwoods. The tires/wheels make all the difference on how an axle is rated. C-50's could easily have a 5K front and a 15K rear and be rated as 18K GVWR with small tires.

1953 Chevy 5-window 3100
In the Stovebolt Gallery
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Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain