Trailer tires are chosen by the weight each one has to carry, not by the size printed on the old tire. Work out the per-tire load first, then buy the load range that covers it.
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The load range already carries one, but rating for GVWR rather than today's actual weight gives you real headroom. If the per-tire figure lands within a few pounds of a band limit, step up a range.
Yes. A spare with a lower rating is only safe at reduced speed and load, which defeats the point of carrying one.
On the federal certification label, usually inside a cabinet door or on the forward roadside wall. The axle rating sticker gives per-axle capacity if you want to cross-check.
Method last reviewed 2026-07-29. Figures are guidance, not a substitute for the ratings printed on your own equipment.