You ask and you shall recieve:
To check front curb height measure the distance between the wheel center (2) and the wheel well housing (1) which should be between the given specifications.
To check Rear curb height measure the distance between the rear shock upper bolt (1) head to the lower bolt head (2).
2500 SERIES AND 3500 SERIES without reinforced axle. Mid Wheel Base Vehicle (3665 mm (144 in.))
FRONT CURB HEIGHT REAR CURB HEIGHT CASTER
467 mm (18.4 in.) Minimum 509 mm (20 in.) 2.6° (±0.5°)
502 mm (19.8 in.) Maximum 501 mm (19.7 in.) 2.8° (±0.5°)
492 mm (19.3 in.) 2.9° (±0.5°)
484 mm (19 in.) 3.1° (±0.5°)
476 mm (18.7 in.) 3.2° (±0.5°)
467 mm (18.3 in.) 3.4° (±0.5°)
460 mm (18.1 in.) 3.6° (±0.5°)
451 mm (17.7 in.) 3.7° (±0.5°)
442 mm (17.4 in.) 3.9° (±0.5°)
434 mm (17 in.) 4.0° (±0.5°)
426 mm (16.7 in.) 4.2° (±0.5°)
417 mm (16.4 in.) 4.3° (±0.5°)
409 mm (16.1 in.) 4.5° (±0.5°)
400 mm (15.7 in.) 4.7° (±0.5°)
392 mm (15.4 in.) 4.8° (±0.5°)
3500 SERIES with reinforced axle. Mid Wheel Base Vehicle (3665 mm (144 in.))
FRONT CURB HEIGHT REAR CURB HEIGHT CASTER
497 mm (19.6 in.) Minimum 509 mm (20 in.) 2.7° (±0.5°)
513 mm (20.2 in.) Maximum 501 mm (19.7 in.) 2.9° (±0.5°)
492 mm (19.3 in.) 3.0° (±0.5°)
484 mm (19 in.) 3.2° (±0.5°)
476 mm (18.7 in.) 3.3° (±0.5°)
467 mm (18.3 in.) 3.5° (±0.5°)
460 mm (18.1 in.) 3.7° (±0.5°)
451 mm (17.7 in.) 3.8° (±0.5°)
442 mm (17.4 in.) 4.0° (±0.5°)
434 mm (17 in.) 4.1° (±0.5°)
426 mm (16.7 in.) 4.3° (±0.5°)
417 mm (16.4 in.) 4.4° (±0.5°)
409 mm (16.1 in.) 4.6° (±0.5°)
400 mm (15.7 in.) 4.7° (±0.5°)
392 mm (15.4 in.) 4.9° (±0.5°)
2500 SERIES AND 3500 SERIES without reinforced axle. Long Wheel Base Vehicle (4325 mm (170 in.))
FRONT CURB HEIGHT REAR CURB HEIGHT CASTER
467 mm (18.4 in.) Minimum 509 mm (20 in.) 2.9° (±0.5°)
502 mm (19.8 in.) Maximum 501 mm (19.7 in.) 3.1° (±0.5°)
492 mm (19.3 in.) 3.2° (±0.5°)
484 mm (19 in.) 3.3° (±0.5°)
476 mm (18.7 in.) 3.5° (±0.5°)
467 mm (18.3 in.) 3.6° (±0.5°)
460 mm (18.1 in.) 3.7° (±0.5°)
451 mm (17.7 in.) 3.9° (±0.5°)
442 mm (17.4 in.) 4.0° (±0.5°)
434 mm (17 in.) 4.1° (±0.5°)
426 mm (16.7 in.) 4.3° (±0.5°)
417 mm (16.4 in.) 4.4° (±0.5°)
409 mm (16.1 in.) 4.5° (±0.5°)
400 mm (15.7 in.) 4.7° (±0.5°)
392 mm (15.4 in.) 4.8° (±0.5°)
3500 SERIES with reinforced axle. Long Wheel Base Vehicle (4325 mm (170 in.))
FRONT CURB HEIGHT REAR CURB HEIGHT CASTER
497 mm (19.6 in.) Minimum 509 mm (20 in.) 3.0° (±0.5°)
513 mm (20.2 in.) Maximum 501 mm (19.7 in.) 3.1° (±0.5°)
492 mm (19.3 in.) 3.3° (±0.5°)
484 mm (19 in.) 3.4° (±0.5°)
476 mm (18.7 in.) 3.5° (±0.5°)
467 mm (18.3 in.) 3.7° (±0.5°)
460 mm (18.1 in.) 3.8° (±0.5°)
451 mm (17.7 in.) 3.9° (±0.5°)
442 mm (17.4 in.) 4.1° (±0.5°)
434 mm (17 in.) 4.2° (±0.5°)
426 mm (16.7 in.) 4.3° (±0.5°)
417 mm (16.4 in.) 4.5° (±0.5°)
409 mm (16.1 in.) 4.6° (±0.5°)
400 mm (15.7 in.) 4.7° (±0.5°)
392 mm (15.4 in.) 4.9° (±0.5°)
P.S. I love copy/ paste
Carl