Marched like first two steam roller designs (6)
I believe the answer is:
strode
'marched' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for strode that I've seen before include "Paced" , "Walked fast with long steps" , "went on foot" , "Galumphed" .)