What, none of you guys know how to tie a "Trucker's hitch"?.
How about chalking the tires too?
For about $15, you can get 50' of 3/16" dyneema ATV winch rope. It has a breaking strength of well over 5k. With a proper truckers hitch, you can tie down a UTV much tighter than any of the ratchet straps mentioned on here.