Steering & alignment guides (truck alignment, steer-axle wear patterns)

• Source / publisher: TMC Recommended Practice RP 642B "Total Vehicle Alignment" (ATA Technology & Maintenance Council); OEM service documentation (Navistar alignment target values, Mack axle-alignment bulletins)
• Type: standard | guide (recommended practice + OEM service specs)
• Topics: steer-axle toe/caster/camber, thrust angle, scrub/tram, drive- axle alignment, tyre-wear-pattern diagnosis (cupping, feathering, shoulder wear), ride-height prerequisites, post-repair alignment
• Vehicle scope: truck
• Region: global (US convention; specs are OEM-specific)
• Language: en
• Link: Navistar alignment target-value bulletin (host: NHTSA TSB mirror): static.oemdtc.com ; Mack axle-alignment spec bulletin: static.nhtsa.gov ; TMC RP 642B is members-only — review/commentary: thetruckersreport.com
• License/access: OEM bulletins public (TSB mirrors); TMC RP = membership
• Notes: RP 642B is THE alignment reference but paywalled — teach the concepts (thrust angle = king of misdiagnosis) and cite it; use the OEM bulletins for concrete target numbers. Wear patterns cross-link to the TMC conditions guide.