A Baja trip is not long by mileage. It is hard by surface. Highway 1 south of Ensenada is narrow, often without a shoulder, and the good pavement ends wherever the last repair crew stopped. The side roads to the beaches people go for are washboard, sand and rock. Add heat, dust and a trailer parts counter two hundred miles away, and the arithmetic changes: everything you would have fixed eventually should be fixed before you cross.
Bearings and seals come first
Washboard is the worst thing that happens to trailer bearings. It shakes grease away from the rollers and works dust past a tired seal. Heat does the rest. If your bearings are anywhere near their service interval, do them now, not when you get back.
- Repack or replace before the trip. Our Timken 12 inch set and Timken 10 inch set cover most trailer hubs, and the repack and replace walkthrough has the procedure.
- Replace the seals, always. A seal is a few dollars and it is the only thing keeping Baja dust out of a fresh repack. Never reuse a cotter pin either.
- Check that every wheel cap seats properly. A cap pried off and hammered back on lets dust straight in.
- Boat trailers get one more question. If yours runs spring-loaded grease caps, read bearing buddies versus a proper repack before you rely on them for a salt-water launch followed by a washboard drive out.
Brakes, because the grades are real
The climbs and descents between Ensenada and San Quintín, and again around Cataviña, ask more of trailer brakes than a freeway run does.
- Pull a drum and look at the shoes and the magnet. If the linings are thin or the magnet face is scored, fit new electric brake assemblies in pairs across the axle.
- A scored or out-of-round drum wastes new shoes. A greased brake drum hub with bearings already installed is the fast fix.
- Set the controller gain for the loaded trailer before you leave, and read brakes weak or grabbing if either shows up on the first grade.
- If you launch in salt water, brakes that survive salt water is the guide for that.
Tires, suspension and the parts that shake loose
Heat plus washboard finds an old tire. Check the DOT date code on all of them including the spare, set pressure cold to the trailer's placard, and carry a gauge you trust. Our trailer tire buying guide covers load range.
Then go looking for fasteners. Washboard undoes what stays put on pavement: U-bolts, shackle bolts, shock mounts, spare tire carriers, propane locker hinges, cargo rack bolts. Put a wrench on all of it. Off-road trailer suspension maintenance has the walk-around.
Dust is the other constant. Door, hatch and wheel-well seals that pass on a highway trip will not on a Baja side road. Where dust gets in and what seals it is written for one brand, but the entry points are universal.
Lights, breakaway and 12V
- Test the breakaway before you leave the driveway, using the method in how to test a trailer breakaway system. A dead breakaway battery is the commonest failure on a trailer that has been sitting. The CURT 12V breakaway kit includes an LED test light.
- Replace a tired 7-way plug before the trip, not on the road. Corroded pins cause the intermittent brake and light faults people spend a whole trip chasing.
- Protect the DC side properly. A Victron MEGA fuse at the battery and a reachable manual reset DC breaker let you isolate a problem at a beach camp instead of guessing.
- Know your real state of charge. Past the towns you are on solar and whatever the truck put in. A SmartShunt reports amp hours in and out in an app, which matters more when the next shore power is four days away.
The spares box for a place with no trailer store
Baja has good mechanics and very few trailer parts. Assume anything trailer-specific comes with you.
- A full bearing and seal set for your hub size, plus grease, a spare cotter pin or two, and a spare wheel cap.
- A greased brake drum hub with bearings in it. This is the highest-value spare on a Baja trip, because it turns a failed bearing into a wheel change.
- A pair of electric brake assemblies if you are going past Guerrero Negro.
- A spare 7-way plug, spare lights or LED modules, fuses, and dielectric grease.
- Two mounted spare tires, not one, if you are leaving the pavement, plus a plug kit, a compressor and a jack rated for the loaded trailer.
- Water, more than you plan to use, and a way to filter what you find.
Ten spares every off-road camper should carry is the longer list.
The cross-border facts
This is the part people get wrong, so treat every number below as something to confirm on the day.
Mexican auto insurance is required, and your US policy is not it. The U.S. Embassy in Mexico is blunt: get Mexican auto insurance, because your U.S. insurance is not sufficient and you must have a separate policy. The State Department's Mexico page says Mexican insurance is required for all vehicles. Buy from a provider licensed to write insurance in Mexico, make sure the policy covers the trailer or the boat and trailer as well as the tow vehicle, and carry the proof in the truck. We do not recommend a company. Compare a few, read what is excluded, and check the liability limit rather than the price.
A boat needs its own permit, and the trailer rides on it. Mexico's customs agency, ANAM, says recreational vessels over four and a half meters, "incluyendo los remolques para su transportación", are temporarily imported under a Banjercito permit. ANAM gives the term as ten years with multiple entries and exits, and the cost as 45 US dollars plus IVA online or 51 plus IVA at a module. Apply online before you go rather than in line at Otay Mesa or Calexico.
Vehicle permits depend on where you are going. Banjercito issues temporary vehicle import permits, and its page says the service is for Mexican residents abroad and foreign tourists, at the same 45 or 51 dollars plus IVA, with a refundable deposit on top. Requirements differ by destination and by whether you take a ferry to the mainland, and the rules change. Check your route on the Banjercito site before you leave, not at the booth. Immigration paperwork is separate again, handled by INM at inm.gob.mx.
What you can bring in duty-free. As of September 2026, ANAM states a duty-free allowance of 500 US dollars in goods per passenger, in addition to personal luggage, backed by an invoice or sales receipt, whether you enter by land, air or sea. Family members arriving together in the same vehicle may pool their allowances, and goods above the allowance pay a flat 19 percent rate up to 3,000 US dollars.
Other official pages still show older, lower land-crossing figures, so check the current allowance with Mexican customs before you cross and keep your receipts either way. In practice a bearing kit, a brake set or a 7-way plug is a small declaration. A lithium bank, an inverter or a full solar kit is not, so plan on declaring it and paying at the line.
Buy before you cross
We ship within the United States only. If you are heading south, order early enough to have the parts in hand before you cross, or collect them at our counter in Upland, California on the way down. Upland is roughly two hours from the San Ysidro and Otay Mesa crossings and about three from Calexico, so it fits a morning of the drive.
If you are travelling with a club or a caravan and want one box built for the group, send us the axle rating, lug pattern and hub size for each trailer and we will put the right bearing, seal and brake sets together so nobody in the convoy is the one waiting for a part in Guerrero Negro.