Just found this great idea for tie-down

[Mark Yacavone]

Originally Posted by Bernie Cunningham

Heck, I built me own 10 years ago out of 1/2" rod and have never had a problem.
Mark, are you kidding me, it's gonna rub thru 1/2" steel going down the road ???
I like to tie my chassis down, rather than the rear end, don't need the excessive wear of road mileage on the suspension pieces. I also re-adjust my shocks to full stiff as I believe the car will bounce like a SOB in the rear, anything past the last axle on ya trailer will get a really bumpy ride!

Nope, I'm not Bernie. Just don't like it. I 'm an open trailer guy and I don't like a source of noise and possible burrs from rubbing.
My theory , having spent many years towing on the Cross Bronx Expressway, where it looks like the Air Force conducts bombing practice, is to secure the front tight, preferable with a support under the front cross, and let the rear bounce a little.
If you want the rear to never move, you'll need (A) to pull the the suspension down excessively, or (B) place stanchions under the rear frame and tighten securly so it doesn't rub, and you know how I feel about that..