I have a simple solution to the problem and used it once to transport my 9A from San Diego (300++ miles) to Tucson.
I assume the wings are off and the gear is mounted. If you have access to a fork lift and a flat bed car trailer, lift the airplane from the engine mount and a band under the belly further back.
Of course, RV wheels are wider than most flat bed trailers so create a cradle out of box steel that spans the trailer. Mig weld the cradle to the trailer and then cut the cradle off when you are done.
Once the plane is on the trailer, deflate the RV tires, secure them to the cradle (which is narrower than the tire) using tow straps, and then re-inflate the RV tires which will secure the wheels into the cradle.
If you cannot locate a fork lift, any small tractor or backhoe will suffice to lift the plane or 6 strong buddies.
The border guards flipped out when we crossed from CA to AZ @ 1:30am and everyone who passed us gawked like crazy.
Here is a photo WITHOUT the trailer straps that we used to hold the wheels/tires into the cradle.
Barry
Tucson
