I'm no expert and likely did it wrong since I only used three points on my L4400. I ran chain around the axle housing on each side of the front and then ran one chain throught the draw bar bracket underneath the tractor and anchored each end to a corner of the trailer . Used ratchet chain binders.
Chains scratched the paint on the axle housings up front and now there's a little rust, but hey, its a tractor.
That's what I've done. Its worked each time. Never killed anybody. But that doesn't mean I did it right.