Here's why:
* Manual Transmission Damage: Towing a manual transmission car with the drive wheels on the ground (as is common with tow dollies and some tow bar setups) can severely damage the transmission. The engine spins freely, and the transmission's internal components are lubricated by the movement of the gears. When towed, the transmission isn't properly lubricated and the gears can be damaged from the rotation of the driveshaft.
* Drivetrain Damage: Similar damage can occur to other components in the drivetrain.
* Other Potential Issues: Even with a "drive-shaft disconnect" on a tow bar, there are still risks.
To safely tow a Miata behind an RV, you would need a *flatbed trailer*. This keeps all four wheels off the ground, preventing any drivetrain damage.
In summary, while you *could* technically tow it incorrectly, you'd risk significant and costly damage to the Miata's transmission and drivetrain. A flatbed is the only safe and recommended method.