The short version
- The common figure for RV wheel bearings is 12,000 miles or 12 months, whichever arrives first.
- The two big axle makers do not agree. One publishes 12,000 miles or a year, the other annually or 36,000 miles.
- An EZ Lube fitting is a top up, not a service. Both makers still want the hubs pulled and inspected.
- Months matter as much as miles here, because a trailer that sits is doing its own kind of damage.
A travel trailer can cover two thousand miles a year and still eat a bearing. That catches owners out, because they are counting the wrong thing.
The clock does as much work as the odometer on a trailer.
The interval, and the honest disagreement
| Source | Interval |
|---|---|
| Dexter | Roughly 12,000 miles or 12 months |
| Lippert | Annually or about 36,000 miles |
| EZ Lube guidance | Pull and inspect yearly regardless of the fitting |
| Practical owner consensus | Once a year, before the first long trip |
Those mileage figures are three times apart. That is worth knowing rather than averaging, and both do agree on the yearly part.
Since almost no trailer covers 12,000 miles in a season, the annual inspection is the number that actually governs.
Why RV wheel bearings care about time
Grease separates while parked. The oil migrates away from the thickener and pools low in the hub.
Condensation cycles through the hub as temperatures swing. Moisture then settles on races that never turn.
Park a loaded trailer on one spot for six months and the rolling elements press the same patch of race the whole time.
The full argument is on the sitting page, and the storage side of grease is on the RV grease page.
What EZ Lube does and does not do
A hollow spindle carries grease from a fitting at the end out to the inner bearing. Fresh grease pushes the old grease outward.
It cannot tell you that a race is pitted, that a seal lip is gone or that water has already been in there.
Pump it too fast and the pressure blows the inner seal, which puts grease on the brakes. Turn the wheel while pumping and go slowly.
How the system works in detail is on the EZ Lube page.
Weight is the other half of the story
A loaded travel trailer runs its bearings much closer to their rating than a car does. Bearing life falls steeply with load, not in proportion to it.
So a trailer loaded near its rating and one loaded halfway do not differ slightly in bearing life. They differ a lot.
Tandem axles help, provided the load sits between them. A nose heavy or tail heavy trailer overloads one axle while the other coasts.
The arithmetic behind that is on the load rating page and the weight page.
Doing the annual service
- Pull each hub rather than relying on a grease fitting.
- Clean everything off, including the spindle, and inspect the races in good light.
- Replace every seal, since they cost little and are the reason you are here.
- Pack by hand until grease comes through the wide face of each bearing.
- Set the adjustment properly, seating under rotation and then backing off to a small end play.
A trailer spindle nut sets bearing clearance. A large torque figure taken from a car crushes the bearing and generates heat immediately.
Seat, back off, and leave a small measurable end play.
The method is on the adjustment page and the reasoning on the preload page.
Before a long trip
Rock each wheel at twelve and six, spin it and listen, and check that no grease has been thrown onto the inside of a rim.
Then check hub temperatures at the first fuel stop and compare them across the trailer. One hot hub is the warning worth acting on.
The comparison method is on the temperature page, and what happens if it is ignored is on the seizing page.
Common questions
How often should RV wheel bearings be repacked?
Once a year is the practical answer. Dexter publishes 12,000 miles or 12 months, and Lippert publishes annually or 36,000 miles.
Why do the manufacturers disagree?
They specify different axles and assume different duty. Both agree on the annual part, which is what binds in practice.
Is the EZ Lube fitting enough?
No. It refreshes grease, but it cannot show you a pitted race, a failed seal or water already inside.
My trailer barely moves. Do I still need to service RV wheel bearings?
Yes, and arguably more. Grease separates while parked, and condensation works on races that never turn.
What torque goes on the spindle nut?
Not a car figure. Seat the bearing while turning the hub, then back the nut off and leave a small end play.
Do tandem axles share the load evenly?
Only if the trailer is balanced. Poor weight distribution loads one axle far harder than the other.
How do I check on the road?
Feel every hub at each stop and compare them. A single hot hub is the signal to stop and look.