[tevake]

I sure do appreciate this discussion and all the links, some I had not found before .
Clearly there are many opinions and generalities at play on the subject.

The threads I had not come across before were some of the ones with real long term successful experience at towing 911s four down. This supports my original conclusions
And helps me move forward with the plan.

There is one more question About my particular setup that that has me wondering if the choices I've made will work out OK.

Because of the very long overhang at the back of the airstream, I was concerned about attaching the tow bar to a point under the car. Thinking that the angle of the tow bar would not allow enough range of travel to accommodate the up and down motion between the two vehicles as they move over the unavoidable uneven terrain encountered.

So I chose to use the receivers that mount behind the bumper, replacing the original bumper struts and meant to be used for tow hooks for track use. Attaching the tow bar at the bumper on the car will allow much freer range of travel for the tow bar.
The supplier of the receiver strut says it's meant for track use only . This seems to me a way to avoid liability from possible road accidents. But is a little worrying.
The use in a track situation typically would involve a single strap hooked to one point, using only one strut to pull the car.
My use will be spreading the load to both struts.
Anyone here familiar with these struts and their mounting to the tub? Thoughts on their suitability for my application.

Thanks again for the helpful input.

Cheers Richard