Bus-Easy-4 trailer reversing aid

Reversing alarm for large trailers and caravans
ParkWarn Bus-Easy-4

Reversing system for caravans, large trailers, and sales vehicles—reversing can be so easy.

This reversing aid, designed specifically for trailers of all sizes, helps you to reverse your vehicle and trailer combination easily and safely, or even into any parking space. Thanks to the Easy Key for the cigarette lighter, this reversing alarm for trailers and caravans works with any towing vehicle. Once retrofitted to your caravan, trailer, or sales vehicle, you can change the towing vehicle as often as you like.

Reversing aid for caravans, large trailers, and sales trailers

The Bus-Easy-4 reversing system and parking aid was developed specifically for trailers, as it requires no cables or radio signals and provides completely reliable warnings of obstacles behind the trailer combination. Once mounted on your caravan/trailer, you will have a reversing warning system for any vehicle, with the distance to an obstacle behind the combination indicated as usual by warning tones. Finally, you know if there is an obstacle behind your trailer/caravan and can reverse and park without any additional help.

How MobilWarn Bus-Easy-4 works

Thanks to the latest CANBus technology, the signal is transmitted via the vehicle’s ground cable without interference and without additional cables or disruptive radio waves/WiFi. The Easy Key receiver provides the signal tone and is simply plugged into the cigarette lighter in the towing vehicle, making it usable with ANY vehicle, which means that the towing vehicles can be changed as often as desired. The system is connected by simply plugging the trailer plug into the trailer socket, and the reverse sensors are activated by engaging reverse gear.

Change the towing vehicle for the trailer/caravan/sales vehicle as often as you like

As a rule, towing vehicles are changed more frequently than caravans or sales trailers. With this reversing aid from MobilWarn, you only need to mount the 4 sensors on the trailer once. After that, you will have a reversing alarm with every vehicle thanks to the Easy Key, as you only need a vehicle socket (cigarette lighter socket). This can be located at the front of the vehicle or you can use the vehicle socket in the trunk, if available. If you change vehicles or lend your trailer to someone else, you only need to hand over the Easy Key and the reversing aid will also switch to the new towing vehicle. If you have several vehicles that regularly tow your trailer, you can equip each vehicle with a second or third Easy Key receiver, so you don’t have to keep passing the Easy Key around.

Einfache Installation

Die Installation ist denkbar einfach, da lediglich die vier Sensoren am Wohnwagen / Verkaufswagen montiert werden und das CAN-BUS-Sendemodul wird mit dem Rückfahrscheinwerfer des Anhängers verbunden. Schon ist das System fertig installiert und sendet das Signal störungsfrei und zuverlässig über das Massekabel des Fahrzeugs, sobald der Anhängerstecker mit dem Zugfahrzeug verbunden wird. Alle Bauteile sind mit der Schutzklasse IP67 wasserfest verkapselt, so dass das System sogar für Bootstrailer geeignet ist.

Connecting the system

The Bus-Easy-4 system is simply connected to your caravan’s electrical system. This gives you the advantage of automatically activating the parking system as soon as you put the vehicle in reverse gear. If your vehicle approaches an obstacle, the 4 sensors detect the danger and the Easy-Key emits a clearly audible alarm inside the vehicle, which can also be heard clearly by hearing aid users. The system works day and night, helping you to park your vehicle safely and quickly and effectively avoiding scratches and dents. Thanks to the interference-free CanBus technology, the system is particularly quick and easy to install. The special feature of this system is the Easy Key: once you have installed the system permanently in your caravan, you can change the towing vehicle as often as you like.

Your towing vehicle does not yet have a reversing aid: Here is the solution

The MobilWarn reversing system is also suitable for retrofitting in any car, van, or SUV. Install the “Bus-Easy-4” system in your trailer and the “Bus-Light-4” reversing system in your towing vehicle for a completely convenient solution. Without a trailer, the reversing system works just like in any car. The moment you couple the trailer, the reversing system recognizes this and switches directly to the trailer’s reversing sensors.
If the “MobilWarn Bus-Light-4” is installed in the towing vehicle, you will have an LED display showing the exact distance to the obstacle in addition to the warning tone. Without a trailer, the distance display for the sensors works on the vehicle itself, and with a trailer, the distance behind the trailer is displayed at the front of the vehicle, as the trailer reversing sensors are fully compatible. If you then use a different towing vehicle for your trailer, you can use the Easy-Key receiver in the other car and immediately have the reversing aid for the trailer again.

Preventive protective measure

The costs incurred in the event of an accident or paint damage usually exceed the costs of this system many times over. Since a caravan is used for many years and usually longer than the actual towing vehicle, the system pays for itself very quickly, as the EasyKey system allows you to use this reversing monitoring system with any car, meaning it can be used for years to come.

Protect your insurance premium

If you damage another vehicle with your trailer or even cause personal injury, the “liability insurance of the towing vehicle” will be claimed, which will affect the insurance of your own car and usually increase your insurance premium. In any case, your no-claims bonus will be downgraded in the event of a claim, which will have a negative effect on the insurance premium for your vehicle. Trailer insurance is only used if the trailer has been parked and is not being towed by a vehicle. For this reason, this trailer reversing system actively helps to protect your car insurance premium, as the system can protect you from accidental damage. Even minor damage can quickly exceed the purchase price of this reversing aid many times over.

Ideal for trailer rental, caravan rental, or sales vehicle rental

Protect your capital from damage by equipping your trailers with this system and giving your customers the Easy-Key. Any damage to your caravan or sales trailer is a nuisance. Especially when the next customer is already waiting for the trailer and it has to be repaired first. As a good salesperson, you charge a small fee for this additional protection and recoup the cost of this reversing aid after just a few months.