I do a combo of both.
If towing it 5 miles I judt strap to the axles front and rear and pull tight, one on each corner as described.
But when towing long distance I always tie down as mentioned then run 1 strap front and rear up to the bumper tow points on oposite corners and compress the springs hard. it is all in what mekes ya feel good. I only add the upper bumper straps to keep the sway down. Nary a problem to date.
I haul cars on a daily basis. These cars are junk and going to scrap. With them DOT requires one front and one reear to keep it from rolling. I have never had an issue hauling like that but I would in no way tow my jeep like that..
But remember the jeep isint the most important part of this equasion, nobody wants our 3400lb jeeps on their hood