This innovative product is a mechanical concept with two coupled gears box and is manually operated. The Multi-Gear System operates entirely from the ground, at the front of the trailer. The assembly of this system includes robust and durable components and is a remarkably efficient and easy to operate product. This system is highly appreciated by its users. It quickly became the most popular system, with no equivalent on the market. Your tarp will have never been so easy to operate. Original ElCargo parts are necessary to secure proper mechanism as well as durability of the product.

Mechanized Twin Gearbox System 421


Like all ElCargo’s mechanical tarp systems, the 421 can be fitted to almost any open top trailers. It offers the same benefits as all of ElCargo’s systems: water tightness, the toughness of their anchoring hooks, easy and quick to operate, and most of all sizable fuel economy by as much as 14.93%. Versatile, they can handle any type of bulk transportation including sand, grain, hazmat, etc. ElCargo systems protects your cargo from bad weather, while also protecting the environment.


  • Twin Gearbox System
  • Stainless steel robust lock mechanism
  • Innovative central mechanical assembly
  • External front tensioner
  • Internal rear tensioner
  • Three aluminum winding, center and fixed tubes
  • Rear bow with closing tarp
  • Aluminum bulkhead available in heights from 6 to 16 inches (25-40cm)
  • Central and rear robust steel cross bows
  • Unmatched customer service
  • Fits most open dump trailers
  • Superior quality components
  • Approximate weight of system 190 kg (420 lbs)
  • Easy anchoring, no need for straps
  • Weatherproof cargo protection
  • Fuel saving by as much as 14.93%
  • 3-year warranty against all manufacturing defects
  • 21-ounce vinyl tarp with built-in reinforcement at contact point for prolonged durability

Complete color options

tarp colors
REF 1050
REF 1052
REF 1055
REF 1059
REF 1063
REF 1065
REF 1066
REF 1072
REF 1075
REF 8284