Going back to the original question about identifying what you currently have on the truck, maybe it would be helpful if we could see a picture of the truck showing the wheels and tires, and then a closeup of one of the tires and wheels, plus any of the information on the sidewall of the tire (specifically it will read something like "10.00 x 20 ") Tell us what those numbers are.
Once we know for sure what you actually have, we can be more helpful with making recommendations.
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