How many motor mounts on a 2001 V6 Xterra 4x4?

I see 1 right behind each front tire. My freakin' heavy ass skid plates are in the way of me looking from underneath for the rest, if there are any. I've got a vibration from 60-70 mph. Just eliminating possibilities and inspecting for a broken motor mount.

Had the tires balanced and they are good. Next I'll check the rear brake drums then the driveshaft.

There's another at the rear.

I guess I'll have to drop skidplates after all. Thanks for the info.