The Scottish highlands have a population density comparable to the Mountain West. As someone who grew up in the mountain west, the highlands have a very similar feel.

Several hundred miles, depending where you go.

From where I grew up, it's a four-hour drive to the nearest supermarket.

If you're in the US, you're probably not used to driving long distances on roads that aren't basically perfectly straight and four times the width of your car. You wouldn't enjoy driving here.