The duo is most likely Mike Wolfe and Frank Fritz from American Pickers , the show about hunting for old American relics and antiques.

Why this fits

  • The show is centered on picking up hidden gems, relics, and Americana across the U.S..
  • Your “fat and thin guy” description sounds like a memory mix-up or a nickname-style description of the pair rather than an official title.

Other possible match

  • If you meant a different relic-hunting duo, another search result points to King George Wyant and Tim “Ringmaster” Saylor from Diggers.
  • That show also focuses on relics and American history, so it’s the main alternate possibility.

TL;DR: Most likely Mike Wolfe and Frank Fritz from American Pickers.