Installing a ladder rack on a cargo van means positioning the rack with the manufacturer’s template, mounting to factory points or drilling sealed holes, and torquing fasteners to spec.
Installing a ladder rack on a cargo van transforms how you carry ladders, lumber, and long materials by freeing up interior space and keeping the cargo area organized. Learning how to install a ladder rack on a cargo van correctly comes down to three phases: positioning the rack with the manufacturer’s template, mounting it securely using factory points or drilled pilot holes, then assembling the crossbars and ladder guides. Get these right and the rack will carry heavy loads safely for years. The exact steps vary by van model — Ford Transit, GMC Savana, Chevrolet Express, and RAM ProMaster each need specific mount kits — but the core process stays consistent across all of them.
What You Need Before You Start
Confirm the rack is designed for your van’s wheelbase and roof height. A 54-inch crossbar rack for a Ford Transit 150 will not fit a RAM ProMaster 3500 without the correct mount kit. Gather these tools: a 5mm or 6mm metal drill bit, a torque wrench, a spirit level, masking tape, safety goggles, gloves, and thread sealant for any holes you drill.
Three mount types exist, and the right one depends on your van’s roof design. Factory mounts use existing holes and need no drilling. Rain-gutter mounts clamp to the roof gutters. Drill-in mounts require pilot holes that must be sealed to prevent leaks. If you are still choosing a rack for your van, our guide to the best cargo van ladder racks breaks down the top options for every budget and model.
| Mount Type | Best For | Key Consideration |
|---|---|---|
| Factory Mount | Vans with pre-drilled mounting points | No drilling required; uses existing holes |
| Rain Gutter Mount | Vans with roof rain gutters | Front bar behind front doors, rear bar ~78 inches behind |
| Drill-In Mount | Vans without factory points or gutters | Every hole must be sealed to prevent rust and leaks |
Positioning and Mounting the Ladder Rack
Clean the roof surface and assemble the rack components on a workbench. Apply rubber bar guard strips to the crossbars where they contact the roof. Use the manufacturer’s template to mark the rack position. For a rain-gutter mount, the front crossbar sits just behind the front doors and the rear bar approximately 78 inches behind it. Per Rhino Commercial’s installation guide, measuring twice at this stage prevents misalignment and uneven weight distribution later.
Factory mount: Remove the rubber seals along the roof channels with a trim tool to expose the factory mounting holes. Position the mounting feet directly over these holes. Insert galvanized hardware — a lock washer and flat washer — into each location, apply thread sealant to the bolt threads, and tighten.
Drill-in mount: Mark each hole location with masking tape and double-check alignment with a spirit level. Check for wiring beneath the roof before drilling. Drill at 5mm or 6mm using a metal bit. Insert bolts and attach mounting brackets. Seal every drilled hole with rustproof thread sealant to prevent water from entering the roof panel.
Rain-gutter mount: Place the crossbar assembly on the van so the vertical edge rests centered on the rain gutter. Drill through the male mounting base at the marked spot. Secure with a 2-inch screw, a black nylon washer, a metal washer, and a nylon lock nut.
Assembling and Securing the Rack
With the mounting feet in place, attach the crossbars to the uprights using self-threading screws — two per side on the center crossbar. Install ladder hooks, curved mounting brackets, and any drop-down mechanisms according to the rack’s parts list. Add ladder guides or stoppers: a front-bar stopper near the upright works well for extension ladders, while a rear-bar stopper suits shorter ladders.
Tighten every fastener evenly and torque each bolt to the rating specified in your rack’s manual. After tightening all attachment points, go back and re-check each one. The rack sections must be level and parallel — this is critical for drop-down handles to function smoothly. If it wobbles, re-tighten. Check the bolts again after the first few drives, since new mounts can settle. Seal any exposed drilled holes with rustproof sealant to keep moisture out of the roof panel.
Common mistakes include drilling without sealant, using the wrong drill bit, and skipping factory mounts when they are available. Always check your van owner’s manual for the roof load limit — exceeding it risks roof damage regardless of how well the rack is installed.
FAQs
Can I install a ladder rack by myself?
Yes, but the crossbars are heavy and awkward to lift onto a high roof. Having a second person help position the rack and hold it level while you mark holes makes the job safer and more accurate.
Will drilling holes in my van roof cause leaks?
Only if the holes are not sealed properly. Using rustproof thread sealant on every drilled hole and ensuring the foam gasket covers the opening completely will prevent water from entering the roof panel.
How do I know which mount kit fits my van?
Check the rack manufacturer’s compatibility chart for your specific van model, wheelbase, and roof height. A kit for a Ford Transit 148 mid-roof will not work on a RAM ProMaster 3500, so verifying compatibility before buying is essential.
References & Sources
- Rhino Commercial. “How to Fit a Rear Door Ladder to a Work Van.” Procedures for positioning, drilling, and sealing van roof rack installations.