Put them on the axle instead.
You want to strap the base not the suspended member .
Not muddying a thread with this age-old argument. I do not want my tall rig swaying or bobbing on the trailer. I have towed it tens of thousands of miles in all conditions including emergency maneuvers with not a single issue and some of that time was with a 1500 Chevy that was nearly maxed on GCWR. It works flawlessly and the tie down locations are all positioned to locate and secure the load on the trailer so it does not move at all.
Sorry wasn't intending to derail the thread.
In short securing a vehicle to the trailer by the frame is wrong. That's not a debatable position in my mind. If sway is an issue you can suck the frame down to the axles separately. But you do not want stored energy directly fighting your securing members.
You are using a force multiplier against your straps/chains.
Its not a matter of question of the tow vehicle in application its the force applied to the binder when you hit a bump or, God forbid, come to an abrupt stop in a crash.
What's that saying that gets fed to Fuller around here, just because it hasnt failed yet doesnt make it right,