Also for your list though not horse operas.
Gang Busters
Whirly Birds
Sky King (half an oater)
FBI in Peace and War
The shows may have been in B&W but there was little gray
How about,
Cisco Kid
Burns and Allen(!)
Zorro
FBI
Beulah (starring a black woman)
Hazel(hated it but it was around)
Ozzie and Harriet(responsible for the nuclear family myth)
Amos and Andy...