The self-propelled designation is a key classification criterion under SITC 72331 and its corresponding HTS headings. A scraper with its own engine or motor drive falls here, while towed or push-pull scrapers requiring a separate prime mover are classified elsewhere. Misclassifying a towed unit as self-propelled — or vice versa — can result in duty underpayment or overpayment, so verifying the power source and drive configuration in the manufacturer's technical documentation is critical before filing entry.

Depending on the country of manufacture, self-propelled scrapers may be subject to Section 301 tariffs. Origin is determined by where substantial transformation occurs, not necessarily where final assembly takes place, so importers should obtain a detailed bill of materials and a binding ruling from CBP if origin is uncertain.