A Self-Propelled Modular Transporter (SPMT) is actually a series of axle lines working together to transport very large and heavy loads very slowly, from bridges to space rockets. Each axle line can take up to a maximum 44 tons, as as equipment manufacturers Mammoet explain:
“Each module can be fitted with its own engine and control (steering) system. The modules can be connected side-by-side and/or head-to-tail, to form large ‘platforms on wheels. SPMTs have the possibility of 360-degree steering of the wheels.” (4)
You can see the datasheet for the amazing SPMTs as used in Brazil here:
