To change a trailer tire safely, pull completely off the road onto firm, level ground, turn on your hazards, and chock a tire that stays down. Break the lug nuts loose before you lift. Raise the trailer at the point your trailer maker specifies — on most leaf-spring trailers that is the axle tube near the spring seat — swap the wheel, torque the nuts in a star pattern, and re-check them at 10, 25, and 50 miles.
Park Safely and Chock Before You Touch a Lug
Where you stop matters as much as how you change the tire. Get the whole rig fully off the travel lane onto firm, level ground — an off-camber shoulder or soft grass can let a jack tip or sink under load. Avoid stopping on a curve or a downgrade if you have any choice. Turn on the hazards, set the tow vehicle's parking brake, and if you carry warning triangles, set them out behind the trailer so approaching traffic sees you early. Keep everyone on the side away from traffic while you work.
Before anything lifts, chock a tire that will stay on the ground. On a single-axle trailer, chock the tire on the opposite side, one wedge ahead of it and one behind. On a tandem or triple axle, chock the good tires so the trailer cannot roll while one wheel is off. A trailer has no transmission or engine braking of its own — the chocks and the tow vehicle's brakes are all that hold it in place.
Loosen the Lug Nuts Before You Lift
Crack each lug nut loose about a quarter turn while the flat tire is still on the ground. With the tire's weight and grip planted, the wheel cannot spin, so you can put real effort into a stubborn nut. If you wait until the wheel is in the air, it simply rotates and you are left fighting the jack. Loosen the nuts — do not remove them yet — then set up your lift. A breaker bar or a four-way lug wrench gives you leverage a small socket wrench will not; on nuts that were run on with an impact gun, that leverage is the difference between breaking one loose and rounding it off.
Where to Put the Jack: Follow Your Trailer Maker
This is the step most people get wrong, and the right answer depends on your trailer — always follow the manufacturer's manual or the sticker on the frame first. On a trailer, the wheel hangs off the axle, and the axle is suspended below the frame by leaf springs or torsion arms. If you put the jack under the frame, you lift the body while the springs stretch and the axle droops — you may run the jack out of travel before the flat ever clears the ground, on an unstable load path. On a leaf-spring trailer, place the jack directly under the axle tube as close to the spring seat as you can get, or under the spring seat itself — unless your trailer maker specifies a dedicated frame jack point. On a torsion axle, do not jack the axle tube itself — lift at the frame bracket or spring-arm mounting point the axle maker specifies, since torsion axle tubes are not designed to be jacked. That lifts the wheel directly, with the shortest, most stable stroke.
A few rules keep the lift safe. Use a bottle or scissor jack rated above the weight sitting on that one axle, not the trailer's total weight divided casually. On hot asphalt or soft ground, set the jack on a flat board so it does not punch through or sink. Lift only enough to get the flat off the ground and the spare on — higher is less stable. And never put any part of your body under a trailer that is held up by a jack alone.
The Tandem-Axle Ramp Trick That Skips the Jack
If you tow a tandem or triple axle, a drive-up ramp can raise the flat with no jack at all. These wedge-shaped ramps (Trailer-Aid and similar) give about 4.5 to 5.5 inches of lift. Set the ramp against the good tire on the same side as the flat, then slowly move the trailer the short direction that rolls that good tire up onto it — forward if the flat is behind it, backward if the flat is ahead. As the good tire climbs, its neighbor on the same side lifts clear of the ground. Chock first, keep the tow vehicle's brake ready, and confirm the flat is fully off the pavement before you loosen the last nuts. This only works on multi-axle trailers; a single-axle trailer has no second tire to climb the ramp, so it still needs a jack.
Mount the Spare, Torque in a Star Pattern, and Re-Check at 10/25/50 Miles
Lift the flat off the studs and hang the spare, making sure the cone-seat nuts start by hand for several turns so nothing cross-threads. Run all the nuts down snug in a star (crisscross) pattern, lower the trailer until the tire takes the load, then tighten to your trailer's torque spec — again in a star pattern, so the wheel pulls flat against the hub. We deliberately do not print a number here, because the correct value depends on your stud size and wheel; get it from your trailer's certification label or owner's manual, and our trailer wheel lug nut torque guide walks through the pattern and the tool.
A roadside change is not finished when you drive away. The freshly mounted joint beds in over the first miles and loses a little preload, so most axle manufacturers specify re-checking the torque on a short schedule:
| Checkpoint | Odometer | What to do |
|---|---|---|
| At the roadside | 0 mi | Snug in a star pattern, lower onto the tire, torque to the label spec |
| First re-check | 10 mi | Re-torque every nut to the same spec |
| Second re-check | 25 mi | Re-torque again |
| Third re-check | 50 mi | Final re-torque, then return to your normal schedule |
Ease back up to speed rather than rushing. Check the spare's pressure against the number on its sidewall before you rely on it — our trailer tire pressure guide covers reading that figure. Keep in mind that ST (Special Trailer) tire load ratings are set at a 65 mph baseline; some manufacturers allow higher speeds only with added inflation and reduced load, so a fresh spare is not the moment to push the pace.
No Spare, and What to Keep in the Trailer
Without a usable spare, do not tow on the flat. A deflated tire tears apart in a mile or two and can damage the fender, wiring, brake line, and even the axle — turning a cheap fix into an expensive one. The safe move is to call roadside assistance, or pull the wheel and take just the wheel and tire to a nearby shop for repair or replacement. On a tandem trailer in a genuine emergency you can sometimes creep a very short distance at walking speed to reach a safer spot, but understand you are sacrificing that tire and risking hub and brake damage — it is not a way to continue the trip. This is exactly why a mounted, inflated spare earns its space; our trailer spare tire guide covers sizing and mounting one. Here is a kit that keeps a roadside change to minutes:
| Item | Qty | Spec / note |
|---|---|---|
| Mounted spare (ST, matching size and load range) | 1 | Inflated to the sidewall pressure, checked before each trip |
| Bottle or scissor jack | 1 | Rated above the weight on one axle |
| Drive-up ramp (tandem/triple axle only) | 1 | About 4.5–5.5 in of lift, skips the jack |
| Lug wrench or correct socket + breaker bar | 1 | Sized to your lug nuts |
| Torque wrench | 1 | To reach your label's spec on reinstall |
| Wheel chocks | 2 | One ahead, one behind a grounded tire |
| Reflective warning triangles | 3 | The standard DOT set for warning traffic |
| Board for the jack, gloves, headlamp | 1 each | Board spreads the load on soft or hot ground |
When the flat itself is toast, replace it rather than nurse it — a plug or patch on an ST tire is a shop job, not a roadside fix. From our Orlando, FL warehouse we ship replacement trailer tires free, mostly value-brand ST radials from lines like GOODRIDE and LANDSAIL, and orders often reach the Southeast in 1–3 days. If a curb strike or the failure bent the wheel, we stock aluminum trailer wheels too, and (407) 821-7008 reaches someone who can check fitment. If the old tire failed early or is showing its age, our guide on when to replace trailer tires covers the warning signs worth checking on the rest of the set.
FAQ
Where do I put the jack on a trailer?
Follow your trailer maker's manual first. On most leaf-spring trailers, place the jack under the axle tube close to the spring seat, or under the spring seat itself — jacking a bare frame section lets the springs stretch so the wheel may never clear the ground. Some trailers do have reinforced frame jack points marked by the maker; where those exist they are valid. Torsion axles must be lifted at the frame bracket, not the axle tube.
How do I change a trailer tire without a jack?
On a tandem or triple axle, use a drive-up ramp. Set it against the good tire on the flat's side and slowly roll that tire up onto it — the flat lifts clear. A single-axle trailer has no second tire to climb the ramp, so it still needs a jack at the maker's specified lift point.
How soon do I re-tighten the lug nuts after a roadside change?
Torque them to spec in a star pattern before driving, then re-check at 10 miles, again at 25 miles, and a final time at 50 miles. The joint beds in and loses preload over those first miles, which is why the early re-checks matter.
Sources: Dexter Axle owner's and operation manuals (wheel torque and the 10/25/50-mile re-torque sequence), Tire and Rim Association load and inflation standards, U.S. DOT/NHTSA trailer towing guidance, and drive-up ramp manufacturer instructions (e.g., Trailer-Aid).