i bet that since they are not meant for anything but steering in the desert that they would not be that great with a load, especially if you were using they as a rear drive tire. sidewall probably isnt stiff enough.
Here - I'll be the one to tell you what you want to hear since you aren't listening to anyone.
Sure, you can use it! No problem!
**Disclaimer: These tires are not DOT-Approved. The cops are gonna pull you over constantly. You'll never pass inspection. If you get in a wreck because the tire blew out, you'll be totally liable for any costs associated. After that, you will likely be unable to get insurance ever again. It's very possible the tire WILL blow out after a long run on the highway because it's not designed for that use. Treadwear will likely be VERY poor, so the tires will be insanely expensive to run.***