Tire blowouts are the leading cause of RV roadside emergencies. A 10,000-pound trailer traveling at 65 mph on an underinflated tire isn't a question of if it will fail — it's when. The debris field from an RV tire blowout can shred fender skirts, rip away wiring, and destroy brake lines in seconds. And unlike a car tire failure, an RV blowout can pull you across lanes or flip a trailer.

The frustrating part: nearly all RV tire failures are preventable. Correct pressure, age awareness, weight management, and a TPMS (tire pressure monitoring system) eliminate the vast majority of blowout risk.

Pressure: The Most Important Number

Underinflation is the primary killer of RV tires. When a tire is underinflated, the sidewalls flex excessively, generating heat. Heat degrades the rubber, weakens the internal structure, and eventually causes a catastrophic blowout — often with no warning. An RV tire can lose 1–3 PSI per month just from natural permeation, so pressure that was correct in April may be dangerously low by July.

Check pressure when tires are cold — before driving, before the sun heats them. Hot tires read higher, which masks underinflation. Check every tire, including the spare, before every trip. Use a quality digital gauge (not the gas station pencil gauge).

Inflate to the load-rated pressure on the tire sidewall, not the vehicle's door sticker (which is for the chassis, not the trailer). Trailer tires should typically run at maximum sidewall pressure when the trailer is loaded. Check your tire manufacturer's load/inflation table for the exact pressure that matches your axle weight.

Trailer tires are different from car tires. Trailer tires (marked "ST" for Special Trailer) are designed for the unique stresses of being towed — heavy loads, lateral forces in turns, and long periods of sitting without moving. They have stiffer sidewalls and different rubber compounds than passenger car tires (P-rated) or light truck tires (LT-rated). Never use passenger tires on a trailer — they aren't designed for the load and stress profile.

Age: Tires Expire Whether You Use Them or Not

Rubber degrades over time from UV exposure, ozone, and oxidation — even if the tire has plenty of tread depth. The RV industry standard is to replace tires after 5–7 years, regardless of tread depth or miles driven. Most tire industry organizations cap tire life at 10 years under any circumstances.

RV tires are particularly susceptible to age-related failure because they often sit stationary for weeks or months, exposed to UV radiation, heat cycles, and weather. A tire with 90% tread depth can still fail from age-related sidewall cracking that's invisible from the outside but structurally compromising.

Reading the DOT date code

Every tire has a DOT code molded into the sidewall. The last four digits indicate the week and year of manufacture. For example, "2522" means the tire was made in the 25th week of 2022. If you can't find the DOT code on the outward-facing side, it's on the inward-facing sidewall — frustrating, but standard for many tire manufacturers.

Weight: Don't Guess, Weigh

Overloaded tires fail. Many RV owners have no idea how much their rig actually weighs when fully loaded with water, food, gear, passengers, and fuel. The sticker on the door tells you the maximum ratings — but it doesn't tell you how the weight is distributed across each axle and each tire.

The only way to know for sure is to weigh your RV loaded and ready to travel. CAT Scales (at truck stops across the country) provide axle-by-axle weights. For individual tire weights, RVSEF (RV Safety & Education Foundation) offers corner-weight services at rallies and events. If any tire is loaded beyond its rated capacity at its inflation pressure, either reduce the load or upgrade to a higher-rated tire.

TPMS: Your Early Warning System

A tire pressure monitoring system (TPMS) uses sensors mounted on each tire valve stem to wirelessly transmit real-time pressure and temperature readings to a monitor in the cab. If pressure drops below a threshold or temperature spikes (indicating a potential failure), the monitor alerts you — giving you time to pull over safely before a blowout.

TPMS is especially critical for trailers, where the driver can't feel a tire going soft the way they would in a car. By the time you notice a trailer tire problem visually (wobble, smoke, debris), the failure has already happened. A TPMS gives you 5–15 minutes of warning — the difference between a controlled stop and a catastrophe.

Most RV-specific TPMS systems monitor 4–12 tires and include sensors for both the tow vehicle and the trailer. Look for a system with adjustable pressure thresholds, temperature alerts, and a display bright enough to read in direct sunlight.

Maintenance Checklist

Before every trip: Check pressure on all tires (including spare) when cold. Visual inspection for cuts, bulges, cracking, or embedded objects.

Monthly: Re-check pressure (tires lose 1–3 PSI/month naturally). Inspect sidewalls for weather cracking (small cracks in the rubber surface).

Annually: Check DOT date codes. Inspect tread depth (minimum 4/32" for trailer tires — don't wait until 2/32" like you might with a car). Rotate tires if your trailer setup allows it.

Every 5–7 years: Replace tires regardless of tread depth or visual condition. This is the single most important tire safety rule for RVs, and the one most often ignored.

During storage: Inflate to maximum sidewall pressure. Cover tires to block UV. If possible, move the RV periodically to prevent flat spots. If storing on jacks, keep tires off the ground to eliminate weight-induced flat spots and ground moisture contact.

Tire covers are cheap insurance. UV radiation is the primary cause of sidewall cracking on stored RVs. A set of tire covers costs $30–$60 and can add years to tire life. White or light-colored covers reflect heat better than black ones.