Below is my build sheet. What is ADJ Heavy Duty Service Group and
AHC Trailer Tow Group specifically?


*R1 Premium Cloth 40/20/40 Bench Seat
-AZ Agate
ADAP Light Group
ADJ Heavy Duty Service Group
AHC Trailer Tow Group
AJKP Convenience Group
APDA Lower Two Tone Paint
ASPP SLT Decor Group
A07P 5.9L Engine(EML)/4Sp Auto Trans(DGT) BAZP 136 Amp Alternator BCQP 750 Amp Maintenance Free Battery BGJS Pwr Disc/Drum Rr Anti-Lock Brakes BKAS
11x2 Rear Drum Brakes CBEP 40/20/40 Split Bench Seat CGDS Front Height Adjust Shoulder Belts CGWS Next Generation Front Air Bags** CGZS Passenger Air Bag On/Off Switch CHEP Deluxe Headliner CKEP Front Seat Area Carpet CLAP Front Floor Mats CSPS Passenger Assist Handle CSRP Passenger Assist Handles CUDP Mini Overhead Console CUE Rear Underseat Compartment Storage DGB All 4-Speed Automatic Transmissions DGTS 4-Spd. Automatic 46RE Transmission DHAP Lock-Up Torque Converter DHKS Shift-on-the-Fly,231HD Transfer Case DJCS 195MM Front Axle DMDP 3.55 Rear Axle Ratio DRBP Corporate 9.25 LD Rear Axle DSA Anti-Spin Differential Rear Axle EAAC All Engines EAGC All Gas Engine EML 5.9L V8 MPI Engine GACS Tinted Glass Windows GJDS Rear Fixed Window GNAS Rear View Day/Night Mirror GNMP Passenger Side Sun Visor w/Mirror GTSP Power Heated Mirrors, Fold-Away GVBC All Vehicles W/Power Mirrors HAAP Air Conditioning HGAP Hood Insulation HGBS Dash Liner Insulation JAYS Instrument Cluster w/Tach JCBS 120 MPH Primary Speedometer JHAS Var Intermittent Windshield Wipers JJAS Cigar Lighter JJBS Dual Note Electric Horns JJJS 12V Auxiliary Power Outlet JPBP Power Locks JPDP Power Windows, Driver One-Touch KRXP STRIPE/BADGE/MOLDING/COLOR KTXP STRIPE/BADGE/MOLDING/COLOR K1XP STRIPE/BADGE/MOLDING/COLOR K17P Do Not Use LBAP Map/Courtesy Lamp LBCP Glove Box Lamp LDAS Underhood Lamp LMAS Halogen Headlamps LPES Cargo Lamp MBFS Bright Rear Bumper MCTS Bright Front Bumper MDA Front License Plate Bracket MFDS Bright Grille MHAS Black Windshield Moldings MPBP Black Tailgate Applique MWDS Removable Tailgate w/Caliper Latches MXBS Front Air Dam MXCP Front Bumper Sight Shields NAA Federal Emissions NBKP EVAP Control System NFWS 26 Gallon Fuel Tank NHBP Auxiliary Transmission Oil Cooler NHMP Speed Control NMCP Heavy Duty Engine Cooling PW7A Bright White Clear Coat QFKA Light Driftwood Satin Glow RAAC All Radio Equipped Vehicles RAZ AM/FM Cassette Compact Disc Radio RCEP Infinity Speakers RDDP Fixed Long Mast Antenna SBAS Power Rack and Pinion Steering SCVP Leather Wrapped Steering Wheel SFBS Front Heavy Duty Shock Absorbers SGBS Rear Heavy Duty Shock Absorbers SHAS Front Stabilizer Bar SUAP Tilt Steering Column TBBS Full Size Spare Tire TBMP Tire Carrier Winch TYZ P245/75R16 OWL On/Off Road Tires TZAP Goodyear Brand Tires WD5P 16X7.0 Cast Aluminum Wheels WLBP Steel Spare Wheel WMJP Center Hub XBSS Pickup Box XCMS Vendor Painted Cargo Box XEFP Transfer Case Skid Plate Shield YAAS Build To U.S. Mkt. Specifications

 

Most likely heavier duty equipment for the tow package. Higher capacity radiator, aux. trans cooler, trailer wiring harness, etc. Just factory codes. Someone may be able to decode the actual acronym, but they usually don't mean anything special.

 

The Heavy Duty Service group was usually found on the trucks that were either 4x4 or had the towing package or both.