"Numbers matching?" How does that term apply to AD trucks? What numbers, and to what do they match?
Here is how Wikipedia defines "Number Matching":
Number matching or matching numbers is a term often used in the collector vehicle industry to describe cars with original major components, or major components that match one another.
Many times these major components contain dates, casting numbers, model numbers, Vehicle Identification Numbers (VIN), stamped numbers, or codes that can match the original components that were on the vehicle when it was new.
