Chase Rack Buying Guide: What to Look For in a Truck Bed Rack

Quick answer

Choose a chase rack that is built for your exact truck bed length and cab style, then decide whether you need a basic cargo rack or a modular platform that accepts lighting and brake light attachments. If you plan to add accessories later, prioritize racks with detachable mounts and confirmed accessory support.

A chase rack is more than a bed accessory; it changes how you carry gear, mount lights, and use the space behind your cab. But not every rack fits every truck, and the wrong choice can rattle, block visibility, or leave you without the mounting points you need later.

This guide walks through the practical decisions that matter: bed size and cab configuration, static versus dynamic load expectations, mounting style, and modular accessory support. You will also see how a specific attachment like the ARMORDILLO® LED 3rd Brake Lights Attachment fits into the decision, and why bed protection underneath the rack is worth planning for.

Start with fitment: bed length and cab style

The most common chase rack mistake is buying for the truck model but not the exact bed and cab configuration. A rack designed for a 5.5-foot bed will not fit a 6.5-foot bed, and cab style can affect how close the rack sits to the rear window. Before comparing features, confirm your bed length and cab style from your truck's door jamb sticker or owner's manual.

If you are unsure, measure the inside of your bed from the bulkhead to the tailgate. That number, not the marketing name, determines which rack fits. Racks that clamp to the bed rails often have more adjustment than bolt-on designs, but they still have a defined working range.

• Write down your bed length in inches before you shop.
• Check whether the rack product page lists your exact cab and bed combination.
• If a rack requires drilling, confirm you are comfortable with permanent bed modifications.

Decide how you will use the rack

A chase rack used for occasional weekend gear has different requirements than one used for a chase truck that carries spare tires and tools over rough terrain. Light-duty use favors lighter racks with simple mounting and easy removal. Heavy-duty use favors reinforced steel construction, multiple cross bars, and mounting points that are welded or bolted to the main structure.

Think about what you will actually carry: traction boards, a spare tire, fuel cans, a jack, or lights. Each item needs a mounting surface and a weight rating. If a rack's load capacity is not listed, treat that as a missing specification, not a green light to overload it.

• List your three heaviest items and check whether the rack has dedicated mounts for them.
• Avoid buying a rack that only supports one accessory type if you plan to expand later.
• Remember that dynamic loads (driving) are harder on a rack than static loads (parked).

Mounting style and bed protection

Chase racks typically mount to the bed rails, the bed floor, or a combination of both. Bed rail mounts are common because they are easier to install and remove, but they concentrate stress on the rail. Bed floor mounts spread the load but may require drilling. Some racks use existing factory holes, which simplifies installation.

Whatever the mounting style, the bed under the rack takes a beating from tools, cargo, and vibration. A rubber bed mat adds a non-slip surface and protects the bed floor from scratches and dents. For example, the ARMORDILLO® 2007-2021 Toyota Tundra 8' Bed Diamondback Premium Rubber Truck Bed Mat is designed for that truck and bed length, with a diamond plate anti-slip surface. The ARMORDILLO® 2019-2021 GMC Sierra 1500 5'8" Bed Diamondback Premium Rubber Truck Bed Mat serves the same purpose for that specific application.

• Check whether the rack reuses factory bed holes or requires new ones.
• Add a bed mat before installing a rack if you want to protect the bed floor.
• Confirm that the rack's mounting hardware is compatible with your bed rail thickness.

Modular accessory support: lights, brake lights, and more

One of the biggest differences between a basic rack and a modular platform is what you can attach. Many off-road chase racks include tabs or brackets for LED lights, but not all of them address the third brake light. When you install a rack behind the cab, it can block the factory third brake light, which is both a safety and a compliance concern in many areas.

A dedicated attachment solves that problem. The ARMORDILLO® LED 3rd Brake Lights Attachment (For CR-M Chase Rack) is designed specifically for the CR-M platform and restores rear brake visibility after the rack is installed. It is a detachable steel mount, so it integrates with the rack rather than hanging loose. If you are considering the CR-M rack, this attachment is the kind of accessory that turns a rack into a complete system.

• Ask whether the rack blocks your factory third brake light.
• Look for rack-specific attachments rather than universal clamps.
• Plan your lighting and brake light needs before you buy the rack, not after.

Materials, finish, and long-term durability

Steel is the most common chase rack material because it is strong and repairable. Powder coating helps resist rust, but chips and scratches can still expose bare metal. If you drive in salty or humid conditions, inspect the rack regularly and touch up any damage. Aluminum racks are lighter but may have lower load ratings, so check the stated capacity.

Hardware quality matters as much as the rack itself. Stainless steel bolts and locking nuts reduce the chance of loosening over time. If the rack uses proprietary hardware, confirm that replacements are available before you commit.

• Prefer powder-coated steel for heavy loads and aluminum for weight savings.
• Check for stainless or zinc-plated hardware to resist corrosion.
• Plan to re-torque mounting bolts after the first few hundred miles.

Budget and trade-offs

Chase racks range from simple bolt-together designs to fully welded modular systems. A lower-cost rack may save money upfront but limit your accessory options and require more maintenance. A higher-cost rack often includes better mounting, more cross bars, and specific attachment points that save time and frustration later.

Set a budget that includes the rack, any required attachments, and bed protection. If you are adding a brake light attachment, factor that into the total. The goal is not to buy the most expensive rack but to buy one that matches your truck, your cargo, and your willingness to modify the bed.

• Add up rack, attachments, and bed mat before deciding.
• Do not pay for features you will never use, like extra light tabs.
• If the rack requires drilling, consider installation cost or your own time.

Decision rules for buying a chase rack

• If you drive a truck with a 5.5-foot bed and a crew cab: Prioritize racks that list that exact configuration. Short-bed racks often have a tighter footprint and may not accept full-size spare tires. Verify the rack's bed length and cab compatibility before anything else.
• If you need to keep your factory third brake light visible: Choose a rack with a dedicated brake light attachment, like the ARMORDILLO® LED 3rd Brake Lights Attachment for the CR-M Chase Rack, rather than a universal clamp. A rack-specific mount is safer and cleaner than a generic solution.
• If you carry heavy, shifting cargo: Add a rubber bed mat with an anti-slip surface, such as the ARMORDILLO® Diamondback Premium Rubber Truck Bed Mat for your bed size, to protect the bed and reduce movement. Bed protection is part of the rack system, not an afterthought.
• If you are unsure about drilling: Look for a rack that uses existing factory bed holes or clamps to the bed rails. If drilling is required, decide whether the added stability is worth the permanent modification. Match the mounting style to your comfort with modifications.

Product facts that matter

• ARMORDILLO® LED 3rd Brake Lights Attachment (For CR-M Chase Rack): Designed specifically for the CR-M platform, this detachable steel mount restores and enhances rear brake visibility after installing the chase rack. If you choose the CR-M chase rack, this attachment keeps you compliant and visible without a custom wiring job.
• ARMORDILLO® 2007-2021 Toyota Tundra 8' Bed Diamondback Premium Rubber Truck Bed Mat: Heavy-duty rubber with a diamond plate anti-slip surface, designed to protect the bed floor from scratches, dents, and shifting cargo. A bed mat under your rack protects the bed from the cargo and tools you carry, and the anti-slip surface helps keep items in place.
• ARMORDILLO® 2019-2021 GMC Sierra 1500 5'8" Bed Diamondback Premium Rubber Truck Bed Mat: Flexible, heavy-duty rubber bed mat with diamond plate anti-slip surface for that specific truck and bed length. Confirms that bed protection is available for different truck platforms, so you can match the mat to your exact bed size before adding a rack.

Who should buy a chase rack

Best for

• Truck owners who need organized, elevated cargo space for off-road gear
• Drivers who want to mount lights and accessories above the bed
• Owners of trucks with a compatible bed length and cab style who are willing to verify fitment

Not for

• Truck owners who need a fully enclosed, weatherproof bed cover instead of an open rack
• Drivers who are not willing to confirm bed length, cab style, and mounting requirements
• Anyone who needs a rack for a truck bed size that is not supported by the product

A chase rack is a long-term purchase, so match it to your truck's exact bed and cab, decide on modular accessories like a brake light attachment, and protect the bed underneath. If you start with fitment and work outward, you will end up with a setup that works on the trail and on the road.