Credit: Bill Pugliano/Getty; Richie Buxo/Splash News Online

Did fellow lightning-rod gals Kate Gosselin and Sarah Palin become BFFs while camping in Alaska for Palin's TLC show? Not so much!

A Gosselin source tells the new Us Weekly that the reality mom, 35, had "zero chemistry" with the former governor, 46, while taping a buzzed-about episode of Sarah Palin's Alaska in July.

"They didn't speak off camera," the insider adds. "She said the food and accommodations were terrible, and it was the worst trip she'd ever been on."

Although Gosselin's eight kids loved fishing and looking for firewood with Palin and Palin's children, Gosselin "had a meltdown" in the 53-degree weather and left the campground before sundown, the source reveals. "She just couldn't cope."

For much more on Gosselin and Palin's awkward showdown -- how she was "afraid for the kids' lives," Palin's take on her temperamental guest star and Gosselin's jealousy-- pick up the new Us Weekly, out now!