What Is a Headache Rack?
A headache rack (also called a cab guard, cab protector, or back rack) is a steel or aluminum frame mounted behind the truck cab that protects the cab and occupants from shifting cargo. For flatbed operators, it’s both a safety device and a practical mounting platform for lights, tie-down points, and accessories.
Why Build Custom?
Commercial headache racks cost $500-$3,000 and may not include the specific features you need. A custom-built rack costs $200-$800 in materials and gives you exactly what you want: specific tie-down point locations, integrated tool storage, custom light mounts, and a fit tailored to your truck.
Design Considerations
Material Selection
| Material | Thickness | Weight | Cost | Strength |
|---|---|---|---|---|
| Mild steel tubing | 2″ × 2″ × 3/16″ wall | Heavy (80-150 lbs) | Low ($100-$300) | Excellent |
| Mild steel tubing | 2″ × 2″ × 1/8″ wall | Moderate (60-100 lbs) | Low ($80-$250) | Good |
| Aluminum tubing | 2″ × 2″ × 3/16″ wall | Light (30-60 lbs) | High ($200-$500) | Good (lower than steel) |
| DOM steel tubing | 2″ × 2″ × 3/16″ wall | Heavy (80-150 lbs) | Moderate ($150-$400) | Excellent (superior weld quality) |
Recommendation: 2″ × 2″ × 3/16″ wall mild steel tubing for the frame. It’s strong enough for any cargo impact, widely available, and easy to weld with MIG or stick.
Dimensions
- Width: Match the truck bed width (typically 70-80″ inside the bed rails)
- Height: 24-36″ above the bed rail (higher = more protection but more wind resistance)
- Depth: 2-4″ from the cab (enough clearance for cab flex without rubbing)
Integrating Tie-Down Points
D-Ring Placement
Weld or bolt D-ring plates at strategic locations on the rack frame:
- Top rail: 2 D-rings evenly spaced for over-the-cab strap attachment
- Mid-height: 2-4 D-rings for direct tie-down to cargo behind the cab
- Base rail: 2 D-rings near the bed rail for low-angle tie-downs
D-Ring Specifications
- Material: Drop-forged steel, minimum 3/8″ stock diameter
- WLL: 5,000 lbs minimum per D-ring
- Mounting plate: 3/16″ steel, minimum 3″ × 5″, welded to the rack frame with 3/16″ fillet welds on all edges
- Weld specification: Full penetration fillet welds, minimum 3/16″ throat, all around the plate perimeter
Construction Steps
- Measure the truck: Measure bed width, distance from bed to cab, and desired rack height. Account for cab movement (suspension travel).
- Cut frame members: Use a metal-cutting bandsaw or abrasive chop saw. Deburr all cut ends.
- Tack weld the frame: Assemble the frame on a flat surface. Tack weld all joints. Check for square using diagonal measurements.
- Full weld: Complete all welds with continuous beads. MIG with 0.035″ ER70S-6 wire at 19-21V, 200-250 IPM. Or stick with 6011 root + 7018 fill.
- Weld D-ring plates: Position plates at planned locations. Weld with full fillet welds on all edges.
- Mount to truck: Bolt to bed rails or stake pockets using 1/2″ Grade 8 bolts with lock nuts. Minimum 4 bolts per side (8 total).
- Finish: Grind welds smooth, prime with self-etching primer, and paint with automotive or industrial enamel. Bedliner coating is popular for maximum durability.
Additional Features to Consider
- LED work lights: Mount high on the rack for rearward illumination during night loading
- Beacon light mount: Welded tab for a magnetic or permanent amber beacon
- Chain storage hooks: Welded hooks or clips to hang chains, binders, and straps when not in use
- Tool rack: Welded brackets for shovels, brooms, or pry bars
- Mesh panel: Expanded metal or woven wire panel to prevent small items from sliding into the cab
Safety and Legal Requirements
- The rack must not obstruct the driver’s rear view through the back window (if a rear window exists)
- Rack must not extend beyond the truck’s width (including mirrors)
- All protruding bolts, D-rings, and sharp edges must be positioned where they won’t snag on tarps or straps
- Rack must be painted or coated to prevent rust (rusty racks fail roadside inspections in some jurisdictions)
- Total weight must be within the truck’s payload capacity
Common Mistakes to Avoid
Avoiding these common errors can prevent equipment failure, regulatory violations, and serious safety incidents in the field.
- Over-Tightening the Strap: Cranking the ratchet handle beyond what is necessary can crush fragile cargo and damage the strap fibers. Most loads only require enough tension to eliminate slack, typically 200-500 lbs of preload depending on cargo type.
- Using a Damaged or Frayed Strap: Frayed webbing, cut edges, or a bent ratchet mechanism significantly reduce the rated Working Load Limit. Federal regulations (49 CFR 393.104) require immediate removal of straps with visible damage from service.
- Ignoring the Working Load Limit (WLL): Every ratchet strap has a WLL printed on its label, typically ranging from 500 to 5,000 lbs. Exceeding this limit risks sudden strap failure, which can turn cargo into a dangerous projectile on the highway.
- Choosing Wrong Anchor Points: Attaching straps to weak points like plastic trim or unsecured hooks can cause the entire securement system to fail under braking or cornering forces. Always use rated D-rings, E-track fittings, or stake pockets.
- Skipping Edge Protection: Sharp metal edges, rough wood, or concrete corners can slice through polyester webbing in seconds under tension. Use corner protectors or edge guards rated for the strap width to prevent premature failure.
Frequently Asked Questions
What steel tubing size should I use for a headache rack?
For a standard pickup truck headache rack, 2×2 inch square steel tubing with 0.120-inch wall thickness provides a good balance of strength and weight. For heavy-duty commercial applications, use 2×3 inch or 2×4 inch rectangular tubing with 0.188-inch wall. Round tubing (1.75-inch OD, 0.120 wall) works for lighter racks. All joints should be fully welded using MIG or TIG welding with ER70S-6 wire. The rack must be able to withstand a 50% cargo weight forward impact.
How do I mount a headache rack to the truck bed without drilling?
Use heavy-duty stake pocket mounts that slide into the existing stake pockets on the truck bed sides. Most full-size trucks have 4-6 stake pockets that can support a rack. Fabricate mounting plates that match the stake pocket dimensions and bolt through the pocket’s existing holes. For additional stability, add over-bed clamps that grip the bed rail. This method is fully removable and does not void the truck manufacturer’s warranty.
What tie-down point design works best on a custom headache rack?
Weld D-ring brackets (3/8-inch minimum rod diameter) at the top corners and midpoints of the rack — typically 4-6 anchor points. Position them on the rear face of the rack so they do not interfere with the cab. Each D-ring should be backed by a gusset plate welded to the main frame tube. Alternatively, weld a continuous L-Track rail along the top of the rack for infinitely adjustable tie-down positions. Rate each anchor point and stamp the WLL next to it.