Duffy's Dozen was a prime-time animated sitcom pitched by Hanna-Barbera in 1971. Although it didn't sell, some elements of it were reused in The Amazing Chan and the Chan Clan.
Duffy's Dozen concerns the Duffys, a couple with 12 adopted children and a pet sheepdog. They travel cross country on sight-seeing vacations in a shape-shifting recreational vehicle, somewhat like the Convert-a-Car in Wacky Races.
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