A large RV can clear an obstacle at the front and still hit it seconds later with the rear.
This happens because the back of an RV doesn’t follow the same path as the front during a turn. Two different movements are taking place: off-tracking and tail swing.
Both can put campground posts, fuel pumps, parked cars, signs, and other objects in the path of an RV that appeared to have plenty of room.
What Is RV Tail Swing?
Tail swing is the outward movement of the portion of an RV behind its rear axle as the vehicle turns.
Turn sharply to the right, and the rear overhang initially swings to the left. Turn left, and it swings to the right.
An RV driving instructor demonstrates this effect using cones placed near the back of a motorhome. As the coach turns, the rear moves sideways enough to touch or knock over cones that appeared safely beside the vehicle.
The same basic effect can be seen with buses. A bus-driver training demonstration shows the rear overhang swinging across the curb when the driver turns sharply away from it.
For RV owners, that curb could just as easily be a campsite utility pedestal, tree, sign, another vehicle, or fuel pump.
Tail Swing and Off-Tracking Are Not the Same Thing
Another turning hazard happens at the same time.
Off-tracking occurs when the rear wheels follow a tighter path through a turn than the front wheels.
The RV Geeks demonstrate both effects with a 43-foot motorhome. During a full-lock turn, their rear tires tracked about 4.5 feet inside the path of the front tire.
That means an RV driver has to watch two different areas.
The rear wheels can cut inside the turn while the rear overhang swings outside the turn.
This explains why a driver can successfully get the front of an RV around a corner and still hit something farther back.
Where Tail-Swing Damage Happens
Tight areas create the most obvious problems.
Fuel stations are a common example. Pulling alongside a pump leaves obstacles close to the side of the RV. Turning sharply away from the pump can then swing the rear of the vehicle toward it.
Similar situations occur when leaving campsites, pulling away from curbs, and maneuvering through parking lots.
Drivers can also get into trouble because their attention is naturally drawn toward the front of the RV. While watching the front corner clear something, the rear may be moving toward another hazard.
Give Yourself Room Before You Turn
A simple way to reduce tail swing is to avoid making a sharp turn immediately after moving forward.
When possible, pull farther ahead before increasing the steering angle. That extra distance can move the rear overhang past an obstacle before it begins sweeping sideways.
This is especially useful when leaving a fuel pump, campsite, or curb.
Parking position matters for the same reason. Leaving yourself more room before stopping can make it much easier to get out later without immediately making a hard turn.
Learn How Much Your RV Actually Swings
There’s no single tail-swing measurement that applies to every RV.
Rear overhang, wheelbase, and steering geometry vary considerably between vehicles.
One practical way to learn your own RV is to use soft traffic cones in a large empty parking lot. Place them near the rear portion of the RV, make a slow, controlled turn, and have a spotter watch from a safe location.
The exercise gives you a much better idea of how far the rear actually moves when you turn.
It can also help you see how much the rear wheels cut inside the path of the front wheels.
Walk Around Before Pulling Away
Cameras and mirrors help, but they do not always show every obstacle near the rear corners of a large RV.
A quick walk around the vehicle before leaving a tight campsite, parking space, or fuel station can reveal posts, curbs, signs, and other objects that may end up in the swing path.
Tail swing happens quickly once a sharp turn begins. Knowing what is beside and behind the RV before moving can prevent an expensive mistake.
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