5th Wheel Cab Clearance & Pin Weight Matcher

Calculate 90° jackknife cab clearance, required slider hardware, and pin weight payload capacity.

1. Enter Truck & Trailer Specs

Center of rear axle to back of cab sheet metal/glass window.
Forward distance from kingpin center to trailer front frame edge (standard extended pin box is ~10"–14").
Gross Vehicle Weight Rating from 5th wheel safety cert sticker.
Tire and Loading Information sticker on driver door jamb.
Weight of passengers, dog, bed tools, auxiliary fuel, and hitch frame (~150 lbs).

2. Clearance & Safety Analysis

Cab-to-Trailer 90° Jackknife Clearance Margin:
0.0"
Calculated from axle center to rear cab face at full 90-degree turn.
Hitch Hardware Architecture Required:
Analyzing...
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Estimated Pin Weight Range (20% – 25% GVWR):
0 - 0 lbs
Standard 5th wheel transfer weight applied down onto the truck bed.
Remaining Truck Payload Reserve (at 22% Pin Wt):
0 lbs

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Safety Disclaimer: Calculations provided by this software are mathematical approximations based on static geometry and standard manufacturing tolerances. Real-world clearance margins change under frame articulate roll, uneven terrain camber, off-camber driveways, and cab-mounted accessories (such as headache racks or auxiliary fuel tanks). Always physically measure clearances and verify truck Gross Axle Weight Ratings (GAWR) on a certified truck scale prior to highway travel.