These are a left-over from game development. The supply drop icons still show strange extra wheels under the front ends of these trailers.

It is likely that a game developer did intend for them to be as wide as the trucks, but forgot to subtract the mirrors. This wouldn't even be street-legal in reality, other than with a special wide/large load permit. They use very archaic leaf springs instead of air suspension, which has been common for decades.ДЄlso very strangely, the trailers are about a half a meter wider than the trucks. An average hydraulic panel can lift about 1000 to 1200 kg.ДЄlso worthy of note is the fact that the trailer suspension is from the 1950s. Also, in reality there are some panels that only have 2 cylinders, but those are normally smaller and with a much lesser capacity. In reality a panel like that would indeed have 4 cylinders, but they'd be in pairs where the inner cylinders are in the game. Oddly, the panel has some very unrealistic extra hydraulic cylinders on the sides of the trailers, that make the trailers quite a bit wider. The flatbed will blow up immediately when trying to load a tank.ДЄll three types have a hydraulic loading panel at the rear. The car transporter trailer and the flatbed trailer both cannot haul any heavy cargo because the weight of the cargo causes them to glitch and take damage before eventually blowing up. Some are stationary objects, some are civilian semi-trailers that can appear in traffic and some are usable, but very rarely are they operated by NPCs. Trailers are back again in Just Cause 4 and most of them are functional. They would likely be pulled by vehicles like the Stria Toro. It has two wheels, and is rested on a stand. The base is immovable, however the actual lamp is destructible. These are small immovable yellow trailers found in construction sites and industrial areas with a temporary lamp pole extending from the base. Their wheels resemble the front wheels of a Stria Rustico. Being immovable, they can only act as possible Stunt ramps. These are flat wooden trailers with two wheels. The first 4 wheels are able to turn, if towed correctly. These are the only trailers that have completely functional wheels. The SAMs in Medici are all equipped with their own 8-wheeled trailers. A few of these are also located at abandoned, or Medici Military controlled industrial building ruins. The trailers are often located near cliffs, where they could be used as Stunt ramps. The cargo panel is tilted for ease of loading, but these trailers are all stationary objects and can not be moved. The trailer is designed for transporting a single car, or other similarly sized object. The Autostraad Reisender 7 is designed for towing a semitrailer, which is a type of trailer that doesn't appear in the game. Strangely, the roadside event that spawns them spawns an Autostraad Reisender 7 in front of them, despite that truck not really being able to tow a trailer of this type. These are the 4-wheeled flatbed trailers that are possibly best known for having a Mugello Farina Duo parked on them in Roadside Events. All Bavarium mines have a few of these trailers loaded with large yellow containers of bavarium. Several Towns in Medici have these, and they always spawn on trailers. There are two Chaos Objects that spawn on trailers. One of these trailers is stuck in an underground lab in the mission Electromagnetic Pulse. As a result of this, the cargo falls off very easily and the trailers can only be towed using larger vehicles, like trucks. This is actually very realistic for modern truck and trailer brakes that work with pressurized air. The wheels on these trailers don't want to turn, causing the trailer to bounce when towed. Most of these trailers are loaded with shipping containers or Small Destructibles, but a few are also empty. The front wheels can turn if towed correctly. They're large black flatbed trailers with 6 sets of double/paired wheels. These are very common in all (or most) military bases in Medici. Trailer types in JC3 6-wheeled flatbed trailer

These trailers are completely immovable and never have any cargo on them. Some villages have 4-wheeled flatbed trailers. The trailers are marked with warnings of hazardous content. Trailer types in JC1 Pesticide tank trailersД¬artel villas in San Esperito and villages have small grey tanker trailers to hold pesticides. Towing by vehicles can be done using the Grappler. Some trailers in the JC games are immovable pieces of scenery that only act as stunt ramps, while others have functional wheels. See wikipedia for more about what a trailer is. 4.7 Missile launchers on immovable trailers.4.2 Immovable Black Hand equipment trailers.

Just cause 4 trailer