Ron, good looking rig and coupe!
I always cross too. When we were drag racing my buddy always chained the rear by going over the axel then under the pumpkin and back over the other axel tube. Acceptable to me, but I usually went from LH trailer up over right tube, under pumpkin, upover LH axel tube and down to right tie down when room allows.
I use to use mostly chains and boomers. You have to be carefull with straps, paying close attention to something they may come into contact with. They can cut real quick if rubbing the wrong thing. I have cut several in the begining, and my buddy lost 10 tires one night when the heavy strap rubbed through on a bead. Went back and found 7 of them.
Seen one guy just go over under one tube then to opposite trailer tie. He told us he had his slick go down on the curvy road home and the chain had losened up and it moved over on him scratching rocker on trailer fender and taking out the brake line on the other side.
Years ago, (when the Ford dealership was next door) the transporter would show up to unload new cars....I would watch them unload/shuffel and reload. They would use the factory frame tie downs and use the ratcheting chain set up and a big cheater. They would suck them down tight against the bump stop rubbers with short chain, pretty much stopping and suspension movement. I asked about that, he said you would have a heck of a time getting it that tight on a car trailer with a chain and boom. Thus not a good idea.