Yes. Your tow vehicle's built-in TPMS only monitors the truck's tires. It has no connection to your trailer tires. A separate trailer TPMS is required for any visibility into trailer tire conditions.
Modern cap sensors are accurate to within ±1-2 PSI, which is more than sufficient for detecting dangerous pressure loss. The TWD-1500's sensors are calibrated at the factory and maintain accuracy across their battery life.
Cap and flow-through sensors add a small amount of weight to the valve stem (typically 10-15 grams). On trailer tires, which are already balanced with less precision than passenger tires, this has no measurable effect on ride quality or tire wear.
Most cap-style TPMS sensor batteries last 12–18 months with normal use. Systems that use Bluetooth 5.0 (like the TWD-1500) tend to have better battery life than older RF-based systems due to lower transmission power requirements.
It depends on the system. The TWD-1500 supports multiple trailer profiles, allowing you to switch between trailers in the app without re-pairing sensors each time. Not all systems offer this — check before buying if you tow multiple trailers.
Set your low-pressure alert to 10-15% below your target cold inflation pressure, and your high-pressure alert to 15-20% above. Never set your target pressure based on the tire sidewall maximum — that's the max, not the recommended. Use the tire manufacturer's load/inflation tables. Our Trailer Tire PSI Guide walks through this in detail.
