Towing Without Limits
The 217 PSI Revolution for Heavy-Duty Rigs
Why 116 PSI Monitoring Fails Heavy-Duty Users
If you are towing a modern 5th Wheel like a Grand Design Momentum or a Keystone Montana, you are likely riding on Load Range G, H, or J tires. These heavy-duty tires often require cold inflation pressures of 110 PSI to 125 PSI. Here is the danger: as you drive, friction and heat cause that pressure to rise. A tire starting at 110 PSI can easily reach 135-140 PSI on a hot afternoon.
Most standard TPMS systems on the market are capped at 116 PSI (8.0 Bar). When your pressure exceeds this limit, these systems either stop reading or trigger constant false alarms. At Grundig Auto, we engineered the S04 series with an industrial ceiling of 217 PSI (15.0 Bar) to ensure you are never driving blind.
Pro Tip: The Signal Challenge of Long Rigs
A 5th wheel combined with a dually truck can exceed 50 feet in total length. The dense metal of the truck's engine and the trailer's aluminum frame act as a barrier to wireless signals. This is why our S04 Solar Kit is designed for 40m stable transmission, with optional repeaters to guarantee zero data loss from your rear axles to the cockpit.
Engineered for the Long Haul
Specifically designed for 6-wheel configurations and high-pressure Load Range G/H tires. Built-in solar charging for 24/7 reliability.
The ultimate flight deck for your motorhome. Features a massive 5-inch display and 40m long-range signal stability.
Professional rim-mounted sensors for 100% theft protection. Best for camper vans and high-value custom wheel sets.
Rig Compatibility Matrix
| Rig Category | Tire Load Rating | Recommended Grundig Model | Primary Benefit |
|---|---|---|---|
| 5th Wheels / Toy Haulers | Load Range G/H/J | S04 Solar (217 PSI) | Handles high PSI heat expansion |
| Class A / C Motorhomes | Load Range E/F | RV01 Panoramic | Maximum visibility & situational awareness |
| Dually Pickups (F-350/RAM 3500) | Commercial Grade | S04 Solar | Seamless 6-wheel monitoring |
| Camper Vans / B-Class | Standard LT Tires | AN-15 Internal | Anti-theft & precision temperature |
Frequently Asked Technical Questions
Q: Why is solar power better for the S04?
Heavy-duty drivers often spend long days on the road. The S04’s high-efficiency solar panel keeps the large-capacity battery topped up without needing messy cables across your dashboard.
Q: Are internal sensors better for high pressure?
While internal sensors like the AN-15 are highly accurate, external sensors on the S04 are preferred for heavy-duty applications because they allow for easier battery replacement and air pressure adjustments in the field.