Um, I should have used a nail or something to probe the floor for the aluminum conduit structure that I drilled into. So the answer I guess is "none"
But I should have. I think the more inboard you go, until you come to the frame rail, the better. My conduit was very close to the outside wall. But mine is a Forest River product and keystone may have a totally different approach. I do know this: The conduit is close to the surface, like flooring material, thin plywood and BANG! Conduit! So you don't have to go too deep to find it, and it is after all hidden inside the cabinet.
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