Laid my down flat using lots of styrofoam and carpeting as padding and strapped them down. Stuck red flags and a light on the overhang --- worked fine with no damage.
I did mine in a small rental from U-Haul. Only 50 miles, but they made it fine in a wing cradle. I added lots of foam in the front cradle and made sure it was positioned by a rib.
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_____________ Peter McCoy
RV9A N35PM S/N:91335
First Flight: April 2013
Hobbs: 400 hours after Oshkosh 2017 www.myrv9.com