I have a 1947 Chevrolet truck data book, that has the 1948 revision in it. My book shows that the 1 ton had the same DeLuxe panel option (390B)
that was available on the 1/2 ton. I saw a 1947 Chevrolet 1 ton panel for sale on eBay a few months ago that had the fenders drilled for the fender trim.
As for the GMC trim, none of the GMC parts books show the fender trim while all of the Chevrolet parts books of the era list the replacement fender trim parts.