Well Captain, If you Really want to tow it and not worry, find a mechanic that knows the cars and tell him that you want to add a DC lube pump. This is how Whosit makes autotrans cars towable 4-down. I am pretty sure it could be done to a Miata as well.
Then there is the report on one of the forums that I read of a sighting of a small rear drive with the rear wheels on the dolly and the front on the ground....
Speaking of which and as a refugee from the Detroit engineering labs, there are more than a few manual trans cars that cannot be towed (long, fast, hard) with the drive wheels on the ground. This is simply because the gearbox has a lube path that passes lube up the geartrain. It is all run by the rotation of the prop shaft. If you talk to the people that designed these things, you would know it was an art.
Matt
