Hybrid + Fishing Bridge Campground Yellowstone

We didn't stay at FB with our hybrid, because it's a parking lot compared to the other campgrounds in the Park.

But were told that if we turtled, we could've stayed there.

Like you said, many don't even know what a hybrid is.
As long as you don't deploy the tent ends, it will be hard sided.

If you don't have the canvas out, you're not soft-sided.