Slightly bigger, because in the US the regulation is on trailer length, whereas European regs are on total length. So Euro trucks are all cab-over designs, whil

Slightly bigger, because in the US the regulation is on trailer length, whereas European regs are on total length. So Euro trucks are all cab-over designs, while American trucks are generally engine-in-front (easier to access for maintenance). But unless you're talking about a double trailer, not much difference.