Airstream mounts skid plates at the rear to protect the bumper from being damaged on steep ascents such as driveways and some ferries. Extending the skid plates downward would help protect a tire carrier and tire if you mount the tire at the rear.
We put the spare in the back of the pickup as far foreward in the bed as possible to take weight off the rear axle. I can understand not wanting to put a tire in the back of your Excursion. It takes a lot of space, but better there than getting damaged at the back. Looks like a battered tire, wheel and carrier would cost around $260.
Gene
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