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4P1Frontline, JLG, Jerr-Dan, London, McNeilus, Oshkosh, Pierce Manufacturing and Smit trucks

Held by Pierce Manufacturing Inc.

WMI 4P1 covers eight makes: Frontline, JLG, Jerr-Dan, London, McNeilus, Oshkosh, Pierce Manufacturing and Smit. Its rules start at model year 1990 and have no end year. Electrified versions appear in its rules: battery electric. Of its 26 models, 14 also appear under other Frontline WMIs.

Models in the decoding rules, by model year

  1. Pierce Mfg1990–1994
  2. Tilt Cab1990–2003
  3. Fixed Cab1995–2003
  4. Arrow XT2004–2013
  5. Custom Contender2004–2013
  6. Dash2004–2013
  7. Enforcer2004–2013
  8. Lance2004–2013
  9. Quantum2004–2013
  10. Saber2004–2013
  11. Impel2005–2013
  12. Velocity2005–2013
  13. Aerial2014–2027
  14. Airport2014–2027
  15. Concrete2014–2027
  16. Defense - Heavy2014–2027
  17. Defense - Light2014–2027
  18. Defense - Medium2014–2027
  19. H-Series2014–2027
  20. Pumper2014–2027
  21. Rescue2014–2027
  22. Tractor2014–2027
  23. Truck2014–2027
  24. Ambulance2017–2027
  25. Recovery2017–2027
  26. Refuse2017–2027

Where the rules place assembly

Plant countryUnited States

Plant locations namedAppleton; Bradenton; Garner; Kewaunee; Louisville; Oshkosh; Dodge Center; Bedford-Mcconnellsburg

Bodies and power

Body classesFire Apparatus, Incomplete, Truck-Tractor, Truck, Ambulance, Step van, Incomplete - Glider

Primary fuelsDiesel, Electric

Compared with the closest code, 10T

10T is held by Oshkosh Corporation. Measured by the overlap of the two model lists, it is the code closest to 4P1.

Models in both14

Only under 4P1Pierce Mfg, Tilt Cab, Fixed Cab, Arrow XT, Custom Contender, Dash, Enforcer, Lance, Quantum, Saber, Impel, Velocity

Only under 10TArticulated, Rear Mounted Engine, Speciality Vehicle, Military, Commercial (HEMTT, HET, PLS, LVS) Series, Commercial Phoenix Series, D.E. - Refuse (Deisel-electric), F / M911 Series, FF Series, Front Concrete Mack (FCM), H Series, J Series, Medium (Class 7) (New and Reman, MTVR, 5TTR, MTT, FMTV) Series, Military (HEMTT, HET, PLS, LVS, FMTV) Series, Municipal Patrol Truck (MPT Truck), New & Reman MTT, 5TTR, M-ATV, NK Series, NL Series, P Series, S Series, T / P-19 / Striker Series, Hulled (Apha, Bushmaster) Series, Light (Class 5) Sandcat Series, Light (Class 6) Series and 3 more

Model years4P1: 1990–open · 10T: 1980–open

Frontline under other holders

Models named in each code's rules

  1. 10T Oshkosh CorporationUnited States41

Other codes starting with 4P

  • 4P2Pace American of Utah, trailer
  • 4P3Mitsubishi Motors North America, passenger car
  • 4P5Pj Trailers Manufacturing, trailer
  • 4P6C M Mart, trailer
  • 4P7Lone Wolf Trailer, trailer
  • 4PAPro Auto Sales & Salvage, trailer
  • 4PBPbm Supply & Manufacturing, trailer
  • 4PFHoss Custom Trailers, trailer
  • 4PGMid-America Trailer Mfg., trailer
  • 4PKPennstyle Campers, trailer
  • 4PMPlaybuoy Pontoon Mfg., trailer
  • 4PTPero Trailer Mfg., trailer
  • 4PYRocking R Enterprises, trailer

Source: NHTSA vPIC, October 2026 release (database updated October 17, 2026). How the figures are counted: How the catalog is read.