This week’s episode of “The Real Housewives of Salt Lake City” is a reminder of an old axiom: Mixing business and friendship can be risky.

Several times this season, cast members have scrutinized Lisa Barlow’s business dealings, including her tequila label, her party-planning company and the various lawsuits that have been filed against her and her husband, John.

In turn, Lisa has questioned the business dealings of other cast members, particularly Whitney Rose and Angie Katsanevas.

Each of the Salt Lake City “Real Housewives” has off-screen pursuits. It’s not unique to the franchise — and a blueprint largely attributed to O.G. “Real Housewives of New York” star Bethenny Frankel, who invented the “Skinny Margarita” and parlayed her reality-show fame to expand the Skinnygirl brand

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