The M870A2 semitrailer, first fielded in April 1997, is an improved version of the M870A1 semitrailer with the same mission of transporting construction equipment and material. Pulled by a prime mover, the M870A2 semitrailer can transport a payload of 40 tons cross-country at 20 mph and on highways at 40 mph.
The M870A2 transports construction equipment, tracked and wheeled vehicles as well as general cargo in containers or bulk. The M870A2 load bed can be configured to load the following containers:
Two 10ft ISO containers, or
One 20ft ISO container, or
At least 3 but no more than 6 SIXCON containers
Landing legs on the M870A2 provide support to the empty trailer when the gooseneck is raised. The semitrailer must attach to its prime mover before loading. The M870A2 can only be loaded using rear ramps or Material Handling Equipment (crane or forklifts). Max weight on rear ramps must remain under 30,000 lbs. Permanent welded steel decking covers the wheels.
The M870A2 gooseneck folds down for loading and unloading. The kingpin is exchangable; both a 2 inch and a 3.5 inch kingpin are provided. An integrated tool box at rear of semitrailer is for storage of tiedown chains, container ISO locks, and the second kingpin. Two under deck storage bins are available for removable outriggers and miscellaneous equipment. A mount is provided on the gooseneck for the spare tire.
For wider loads, the M870A2 can be configured with:
Folding Outriggers. 16 permanent outriggers that swing out.
Removable Outriggers. 8 removable rear outriggers (stored in center storage compartment)
The M870A2 semitrailer has these tiedown features:
D-rings: 22, Used to tie down loads.
Cutouts: 22, Used with outrigger loads so tiedowns do not cross boards.
Lifting Shackles: 4, Used to lift trailer or as tiedown points.
All lights on the M870A2 semitrailer are military 24 volt. The prime mover supplies semitrailer brake air pressure and control of semitrailer brakes as well as electrical power for all lights.
M870A2 Semitrailer Characteristics
Height of Deck
3 ft. 6 in. (no load)
Ground clearance (axle)
1 ft. 2 ¾ in.
Gross Vehicle Weight
3 Non-Driving Tubular
Hub pilot 22.5X8.25 tubeless
The full nomenclature for this trailer is MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), M870A2. The M870A2 was assigned NSN 2330-01-442-4975.
The Operator's, maintenance and parts manuals for the M870A2 include:
TM 07862C-14&P, Medium Heavy Equipment Transporter M870A2
The M870A2 was manufactured by Kalyn Siebert, Inc.
M870A2 Semitrailer Photo Gallery
M870A2 MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), loading ramps raised.
M870A2 MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), front view.
M870A2 MEDIUM HEAVY EQUIPMENT TRANSPORTER (MHET), loading ramps lowered.