ServiceNomad RV · Knowledge
RV Feels Unstable on the Highway
An RV that feels unstable, sways side-to-side, or feels like it's being pushed around by wind or passing trucks is a serious safety issue that must be addressed before continuing highway travel. Swaying can be caused by improper loading, tire pressure issues, suspension problems, worn steering components, or simply driving too fast for conditions. In extreme cases, sway can lead to loss of control and accidents. Understanding what causes instability and how to correct it is essential for safe RV travel.
Weight Distribution and Loading
Proper weight distribution is the foundation of stable RV handling. If too much weight is loaded in the rear, the front axle loses traction and steering authority, making the RV wander and sway. If weight is concentrated on one side, the RV will lean and handle unpredictably in turns. If the RV is overloaded beyond its GVWR (Gross Vehicle Weight Rating), all handling characteristics suffer and component failures become likely. Weigh your RV at a truck scale with all passengers, full fuel and water tanks, and all cargo loaded as you would for travel. Get individual axle weights (front, rear, and each side if possible) and compare them to the RV manufacturer's specifications. Redistribute weight as needed to achieve proper balance, and remove unnecessary items if you're over GVWR.
Tire Pressure and Tire Condition
Underinflated tires are a leading cause of RV instability. Soft tires flex excessively in the sidewalls, allowing the RV to rock and sway, especially in crosswinds or when passing trucks. Overinflated tires can also cause problems by making the ride harsh and reducing the tire's ability to conform to road irregularities, leading to bouncing and loss of traction. Verify that all tires are inflated to the correct pressure for the actual axle weight (see tire manufacturer load/inflation charts). Check pressure when tires are cold—before driving or at least 3 hours after stopping. Inspect tires for uneven wear, cracking, bulges, or age-related deterioration (tires over 6-7 years old should be replaced regardless of tread depth).
Suspension and Shock Absorbers
Worn or failed shock absorbers allow the RV to bounce and wallow, making it feel unstable and difficult to control. Shocks are especially important on motorhomes, where the high center of gravity amplifies any body motion. If your RV bounces more than once after hitting a bump, or if it leans excessively in turns, suspect worn shocks. Suspension components like springs, sway bars, bushings, and track bars also wear over time. Loose or worn suspension allows the axle(s) to shift position, causing unpredictable handling. A qualified RV or heavy-duty truck shop can inspect the suspension, test shock absorbers, and replace worn components.
Steering and Alignment
Loose or worn steering components (steering box, tie rods, drag link, pitman arm) cause play in the steering wheel and make the RV wander. You'll find yourself constantly correcting the steering to stay in your lane, and the RV will respond sluggishly to steering inputs. Severe wear can cause sudden loss of steering control. A steering inspection should check for play in all joints and linkages. Typical allowable play is 1-2 inches at the steering wheel rim—anything more indicates worn components. Alignment is also critical—if the front wheels are not properly aligned, the RV will pull to one side and feel unstable at highway speeds.
⚠️ Safety Notes
- If your RV exhibits severe instability or sudden sway that you cannot control, slow down gradually (do not brake hard), keep both hands firmly on the wheel, and pull over safely as soon as possible.
- Do not continue highway driving with a severely unstable RV—the risk of loss of control and serious accidents is too high.
💡 Prevention Tips
- Weigh your RV and optimize weight distribution before long trips—proper loading is the foundation of stable handling.
- Have suspension, steering, and alignment inspected annually by a qualified RV or heavy-duty truck shop.
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