Best way to tie down 5th-wheel against high winds?

Is it for storm winds from hurricane or general winds off mountain slopes?
If from one direction I would point into the wind direction.

I would first pick a protected spot if possible, with no overhanging trees and then use Earth Anchors with ratchet straps (heaviest ones I could find). Anchor to frame and ratchet down tight...check every once in a while and ratchet down tighter as needed. Use three or four per side.