SPMTs: self propelled modular transporters for heavy moves
When a load is too big for any trailer, an SPMT carries it. How self propelled modular transporters move thousands of tonnes with computer controlled axles, and what a heavy move needs.
7 min read · 2026-07-16
Some loads are simply too big and too heavy for any truck and trailer: a bridge span, a refinery module, a complete building, a piece of process plant the size of a house. Moving them is the work of the self propelled modular transporter, the SPMT. It is a platform on a grid of wheels that drives itself, with no tractor unit, carrying loads from a hundred tonnes to tens of thousands. For a business built on heavy lift and logistics, the SPMT is the machine that moves what nothing else can.
This guide covers what an SPMT is, how it moves, and what a heavy modular move demands.
A platform on wheels that drives itself
An SPMT is a self propelled grid of computer controlled axles. No tractor, no fixed steering, just a deck that carries enormous loads and goes in any direction.
What an SPMT is
An SPMT is an upgraded hydraulic modular trailer that powers and steers itself. The modules connect side by side and end to end to build a deck as large as the load needs, so capacity scales from around 100 tonnes to well over 10,000 by adding units. It is the tool for objects too big or heavy for a conventional trailer, which is most outsized process and infrastructure loads.
How it moves
Each axle is computer controlled and can steer independently through a full 360 degrees, so the SPMT can move forwards, sideways, diagonally or rotate on the spot, all from a wireless remote in the operator's hands. The hydraulic system distributes the load evenly across every wheel and keeps the deck level over uneven ground, and the deck itself raises and lowers around 60 cm to lift or set the load. That control is what lets a vast load thread through a tight site.
| Feature | What it gives |
|---|---|
| Computer controlled axles | Independent steering and load sharing |
| 360 degree steering | Move sideways, diagonally or rotate on the spot |
| Hydraulic suspension | Even load distribution over uneven ground |
| Modular build | Scale capacity by adding units |
| Deck lift | Raise and lower the load hydraulically |
100 t+
to tens of thousands
360°
wheel steering
60 cm
deck lift range
Self
propelled, no tractor
Planning a heavy modular move
- 1
Define the load
Weight, dimensions and centre of gravity set the SPMT configuration.
- 2
Survey the route
Check ground bearing, widths, turns and any structures along the way.
- 3
Build the deck
Configure enough modules for the load with margin.
- 4
Move under control
Drive slowly and precisely, balancing the load across every axle.
The ground carries the whole load
An SPMT spreads its load across many wheels, but the ground and any structure on the route must still carry it. Bearing capacity and route survey are as critical as the transporter itself.
When a load is beyond any trailer, we move it on SPMTs with the route, the ground and the lift planned around it. Tell us the load and the move and we will scope the transport.
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