I ran across a 1979 interview with Linda Gray. She mentioned the rumors of jealousy between her, Victoria and Charlene. It was implied the tension was because the Sue Ellen character was dominating storyline. She denied the rumors, but mentioned she threw a big party at her ranch and invited the Dallas cast. Victoria and Charlene did not attend, but later phoned apologizing and giving excuses.
I assume Charlene was part of the tight knit group of Linda/Larry/Patrick. Larry became kind of a surrogate father to Charlene since she was in and out of foster care most of her life.
Victoria is a mystery. Some people have nice things to say about her, but a lot of people describe her as cold, aloof, distant etc...Joan Rivers hated her guts and ripped her apart every chance she got. The Gibb family blamed her for Andy's troubles after he and Victoria broke up. There were also domestic violence stories with her ex husband and the story of her pulling a gun on her maid. Patrick Duffy once did an interview where he told Sheree J. Wilson that Bobby & April were a true love story and that Bobby/Pam was a mess.....LOL I laughed at that John Beck interview. He said he wished he had worked with Linda more and they were both hoping that would happen. He just described Victoria as professional. I don't think Morgan Brittany has ever described her working relationship with VP.