What Is a Stacker Trailer and How to Use It?

If you are looking for a way to haul multiple cars without compromising space and convenience, you might consider a stacker trailer. A stacker trailer is a type of trailer that allows you to transport multiple cars which are on top of each other. This way, you can maximize the use of your trailer space and avoid excessive trailer lengths.

Stacker trailers are ideal for car enthusiasts, racers, collectors, or anyone who needs to move more than one car at a time. They can also accommodate other types of vehicles, such as motorcycles, ATVs, golf carts, or even boats. However, not all stacker trailers are created equal. There are many factors to consider when choosing and using a stacker trailer for your car hauling needs.

This article will discuss a stacker trailer, such as those sold by Millennium Trailers (https://www.milltrailers.com/stacker-trailer), how to use it, and some tips on choosing the best stacker trailer for your specific needs.

How Does a Stacker Trailer Work?

A stacker trailer utilizes a hydraulic lift system to load and unload cars in an over-under arrangement. The lift system comprises a platform that can be raised or lowered with a hydraulic pump powered by an electric motor or a battery. The platform can be adjusted to different heights based on the size and quantity of cars being transported.

To operate a stacker trailer, you load the lower car onto the platform using ramps or a winch. Then, you raise the platform to the desired height, providing sufficient clearance for the upper car. Next, you load the upper car onto the top deck of the trailer using additional ramps or a winch. Finally, you secure both cars with tie-downs and straps, ensuring stability and balance.

Benefits of Using a Stacker Trailer

Stacker trailers offer many advantages over conventional trailers, such as:

  1. Versatility Stacker trailers are versatile, accommodating various vehicles like motorcycles, stock cars, tools, and equipment. Personalize your stacker trailer with cabinets, ramps, winches, and lighting options.
  1. Enhanced Security Designed with robust tie-downs, straps, and locks, stacker trailers ensure secure vehicle transport. The enclosed options offer protection against weather, theft, and vandalism.
  1. Durability Crafted from top-grade materials such as steel or aluminum, stacker trailers withstand heavy loads and long distances. Sturdy axles, tires, brakes, and suspensions guarantee safe towing.
  1. Convenience Stacker trailers enable efficient transportation of multiple vehicles in a compact space, reducing trailer length and enhancing maneuverability. Fewer trips, decreased fuel costs, and lower toll fees contribute to time and financial savings.

How to Choose the Best Stacker Trailer for Your Needs?

Choosing the best stacker trailer for your needs depends on several factors, such as:

  • The size and number of cars you want to transport
  • The type and condition of your tow vehicle
  • The budget and quality you are looking for
  • The features and options you prefer
  • The availability and accessibility of service and support

Some of the main aspects to consider when choosing a stacker trailer are:

  • The length and width of the trailer
  • The height and weight capacity of the lift system
  • The type and size of the axles, tires, brakes, suspension, and hitch
  • The material and construction of the frame, walls, roof, floor, and doors
  • The electrical and hydraulic systems
  • The interior layout and design
  • The exterior appearance and finish

When choosing a stacker trailer, you should research both online and offline. Compare specifications, features, reviews, ratings, prices, warranties, and customer service. Additionally, visit dealers or manufacturers to inspect the trailers and ask questions before making a final decision.

How to Troubleshoot Common Problems with a Stacker Trailer

Like any other trailer, a stacker trailer may encounter some problems. Here are some of the most common problems and how to fix them:

Trailer sway – Trailer sway is when your trailer moves side to side uncontrollably behind your tow vehicle. It can be caused by improper loading, uneven weight distribution, high wind speed, or sudden braking or steering. To prevent or reduce trailer sway, you should:

  • Load your vehicles evenly on both sides of the trailer and secure them properly with tie-downs.
  • Adjust your tongue weight (the downward force that the trailer exerts on the hitch) to 10% to 15% of your gross trailer weight (the total weight of the trailer and its contents).
  • Use a sway control device (a mechanical or electronic device that applies brake pressure or reduces engine power to keep the trailer in line) or a weight distribution hitch (a device that transfers some of the tongue weight to the front axle of the tow vehicle and the trailer’s axles).
  • Drive at a moderate speed and avoid sudden braking or steering.

Trailer brakes – Trailer brakes are essential for stopping your trailer safely and smoothly. They can be electric, hydraulic, or surge. 

Electric brakes are activated by a brake controller in your tow vehicle. Hydraulic brakes are activated by a master cylinder in the trailer that responds to the pressure of the tow vehicle’s brakes. Surge brakes are activated by a hydraulic actuator in the trailer that responds to the trailer’s momentum. 

To maintain your trailer brakes, you should:

  • Check your brake fluid level and condition regularly and refill or replace it as needed.
  • Check your brake pads and rotors for wear and tear and replace them.
  • Check your brake wiring and connections for damage and corrosion and repair them as needed.
  • Adjust your brake controller settings according to your trailer weight and road conditions.

Trailer tires – Trailer tires are subject to a lot of stress and strain from the weight and movement of the trailer. They can wear out faster than regular tires and cause blowouts or flats. To prolong the life of your trailer tires, you should:

  • Check your tire pressure regularly and inflate them to the recommended level.
  • Check your tire tread depth regularly and replace them when they reach 2/32 of an inch or less.
  • Check your tire sidewalls for cracks, bulges, or cuts, and replace them if damaged.
  • Rotate your tires every 5,000 to 10,000 miles to ensure even wear.


A stacker trailer is a great option for anyone who needs to transport multiple vehicles or other items compactly and conveniently. Stacker trailers offer many benefits, including versatility, security, durability, and convenience. However, they also require careful selection, maintenance, and operation to ensure optimal performance and safety.

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