[gearhead]

If it makes you feel better, carry an extra.
What is your tow vehicle? If you have a pickup truck you could put an extra spare in the bed, properly locked. But don't put it on that sheet metal trailer "bumper".
If most of your travels will be east of the Mississippi, I probably wouldn't carry 2 spares. Out west, maybe.
edit add: I had a blowout last summer in nowhere New Mexico. I wish I had 2 spares. I did not want to drive home, 913 miles, with no spare after using my one. I could not find the brand I wanted and was at the mercy of whatever I could find. I saved the original spare that had only 70 miles on it. I'll throw it in the back of the truck for long trips.