The situation when a car suddenly loses the ability to move under its own power always takes you by surprise. Whether it's a broken transmission, locked wheels or damaged chassis, a standard tow rope or rigid hitch is often useless or even dangerous.
It is in such cases that comes to the rescue tow dolly — specialized equipment that allows you to transport a vehicle with partial loading. This device raises the front or rear axle of the vehicle above the ground, eliminating wear on components and transmissions, which is especially critical for all-wheel drive vehicles.
Unlike the costly cost of calling a tow truck with a full load, using a dolly is often cheaper and allows you to resolve the problem on site faster. In this article we will analyze in detail the design features, selection rules and legal aspects of using this equipment.
Design and principle of operation of the towing trolley
A towing dolly is a frame on wheels that is attached to the towed vehicle near the front or rear wheels. Operating principle is simple: the wheels of one axle are raised above the road surface and fixed, while the second axle rolls along the road. This avoids rotation of shafts and gears in a locked transmission.
The basis of the design is a durable frame made of high-strength steel. On the frame there are supports or grips that hold the wheels of the car. For reliable fixation, belts with a ratcheting mechanism are used to prevent the vehicle from moving while driving.
An important element is the drawbar and coupling device, which connects the cart to the tractor. Hydraulic or mechanical systems lifts allow the operator to quickly and safely secure the vehicle. Some models are equipped with their own braking systems, which increases safety when transporting heavy loads.
⚠️ Attention: Before use, always check the integrity of the belts and the reliability of the wheels. Loosening the fasteners along the way can lead to an accident.
Main types and types of trolleys
The market offers many modifications, and the choice of the appropriate model depends on the type of car and operating conditions. The main division occurs according to the type of driven axis and mounting method.
Most common dolly trolleysthat roll under the wheels. They are universal and suitable for most passenger cars. There are also models with grips on the rims that do not touch the tire, which is important if the tires are damaged.
- 🚗 Classic rolling tackle: lift the car by the wheels using a platform or grips.
- 🔧 Carts with disc gripper: fix the wheel by the rim, leaving the tire free.
- ❄️ Modifications for snow: equipped with skids or tracks for working on slippery surfaces.
- 🚙 Strengthened versions: Designed for SUVs and crossovers with a large mass.
Carts for all-wheel drive vehicles. In such cars, you cannot lift only one axle if the transfer case does not have a neutral. Here, either trolleys with all four wheels are used, or the full loading method is used.
Selection criteria: what to look for
The choice of equipment is a responsible process on which transportation safety depends. The first and main parameter is lifting capacity. It is necessary to take into account not only the vehicle’s own weight, but also the dynamic loads that arise during braking and cornering.
The second critical parameter is ground clearance. If the vehicle is belly-mounted or has a very low bumper, a standard dolly may not be suitable. In such cases, models with an increased approach angle or additional ramps are required.
Pay attention to the material of manufacture and the quality of the welds. Cheap analogs made from low-quality metal can deform under load. Anti-corrosion coating also plays a role, especially if the equipment will be stored outdoors or often used in winter when the roads are strewn with reagents
☑️ Checklist before purchasing a cart
Comparison table of popular models
To simplify the choice, we have prepared a comparative table of characteristics of various types of trolleys. These parameters will help you navigate the variety of offers on the market.
| Parameter | Light trolley | Strengthened model | Professional Series |
|---|---|---|---|
| Load capacity | up to 2000 kg | up to 2500 kg | up to 3500 kg |
| Frame material | Steel St3 | Improved steel | Alloy steel |
| Fixation type | Belts | Belts + chain | Hydraulic grip |
| Structure weight | 45-55 kg | 60-75 kg | 80-100 kg |
When choosing, you should take into account not only the technical characteristics, but also the warranty conditions. Certified equipment undergoes strict tests for tensile strength and metal fatigue, which reduces risks during operation.
Installation and towing instructions
The installation process of the trolley requires strict adherence to the algorithm of actions. Failure to follow the sequence may result in vehicle damage or an accident. First you need to turn off the engine of the towed car and put it in neutral gear.
Roll the cart under the wheels of the selected axle. If you are using a hydraulic model, connect the pump and gently lift the axle until the wheels lift off the ground. Mechanical models require the use of jacks or levers.
Procedure:1. Secure the car with the parking brake (if the wheels are intact).
2. Roll up the cart.
3. Raise the axle.
4. Tighten the fastening straps.
5. Remove from the handbrake.
6. Check the dimensions.
After securing the wheels with belts, be sure to check the tension. Ratchets must be tightened all the way. Then remove the car's handbrake and check the free play.
When towing a car with an automatic transmission, be sure to ensure that the transmission lever is in the “N” (neutral) position. Blocking the transmission while driving will lead to its complete destruction.
⚠️ Attention: It is prohibited to exceed the speed limit of 40-50 km/h when driving a trolley. The braking distance of the hitch is significantly increased.
Legal aspects and traffic rules
The use of the towing dolly is regulated Traffic rules. According to the law, such a hitch is equivalent to a mechanical hitch, but has its limitations. In particular, the driving speed should not exceed 50 km/h.
The towed vehicle must have its hazard warning lights on. If it does not work, an “Emergency Stop” sign is installed at the rear. The towed vehicle can be controlled by the driver in the cabin or remotely, if the design allows it.
It is important to note that in some cases a category of license is required to drive a tractor with a trailer (trolley). «E», if the total weight of the hitch exceeds 3500 kg. However, if the trolley is registered as a trailer and its weight is less than 750 kg, category “B” is sufficient.
Is category "E" required for dolly towing?
If the weight of the trolley is less than 750 kg, category "E" is not required, "B" is sufficient. If the mass of the trolley is more than 750 kg, but the total mass of the road train does not exceed 3500 kg, category "E" is also not needed. Category "E" is only required if the total weight exceeds 3500 kg.
Common mistakes and safety precautions
One of the most common mistakes is ignoring the condition of the tires on the towed axle. If a tire is flat or damaged, you can't just place it on the cart platform—it could slide off. In such cases it is required additional fixation or the use of disc gripper carts.
Dimensions are also often forgotten. The trolley increases the length of the road train, which must be taken into account when maneuvering and turning. When the front axle is raised, the rear overhang of a towed vehicle becomes even greater, increasing the turning radius.
- 🚫 Do not exceed the permissible weight specified in the cart passport.
- 👁️ Always use the “Road Train” and “Attention” insignia.
- 🔗 Regularly check the attachment of the drawbar to the tow bar of the tractor.
Towing safety is 90% dependent on proper wheel locking and compliance with the speed limit. Don't waste time checking fasteners.
Equipment care and storage
In order for a tow dolly to last a long time, it must be properly cared for. After each trip, especially in winter, the structure must be cleaned of dirt, salt and reagents. Corrosion - the main enemy of the metal frame.
Moving parts, such as the rotation axis of the trolley wheels and the gripping mechanisms, should be periodically lubricated. Storage belts require protection from UV rays and moisture, otherwise they will quickly lose strength.
It is better to store the equipment in a dry place, hanging it or placing it on a flat surface to avoid deformation of the frame. Regular visual inspections for cracks in welds will help avoid sudden breakdowns on the road.
Is it possible to tow a car with an automatic transmission on a dolly?
Yes, you can, but only with the drive axle raised. If the car has rear driving wheels, then the cart is rolled under the rear axle. If the front ones - under the front one. The main rule: the drive wheels must be lifted off the ground so that the box does not work.
Do I need to register a towing cart with the traffic police?
Registration is required if the tare weight exceeds 750 kg. In this case, it is equivalent to a trailer. If the weight is less, registration is not needed, but it is advisable to have documents confirming its factory origin.
What is the maximum speed when towing with a dolly?
According to traffic regulations, the maximum speed of a road train with a mechanical coupling (which includes the trolley) should not exceed 50 km/h. Exceeding this limit creates an emergency situation due to changes in braking dynamics.
Is the cart suitable for four wheel drive (4WD)?
For permanent all-wheel drive (Full Time 4WD), the use of a trolley under one axle is prohibited, as this may destroy the transfer case. Such vehicles require full loading onto a tow truck platform or the use of a dolly under all four wheels.
Where to buy a reliable cart?
You should purchase equipment from specialized suppliers of auto service equipment or directly from manufacturers. Avoid handicrafts without certifications as their durability is not guaranteed.