Karl Kustoms Upfitters

We are  an industry leader with over 20 years of experience in product design, manufacturing, and installation. Our large selection of steel and composite van interiors, pick-up equipment, ladder racks, and accessories are available as pre-engineered packages or can easily be mix-and-matched to customize your vehicle.


We are an industry veteran, serving the commercial vehicle market with commercial-grade interiors and ladder racks designed to meet the unique needs of fleet customers.


Masterack manufactures and installs the broadest and most diverse product-line in the industry; with steel, composite, and aluminum cargo management solutions.


Our employees average over 10 years in the industry providing expertise, guidance, and product awareness that equate to better solutions and cost savings for customers.

We offer Kits for the following Vehicles

Chevy City Express

Interior storage systems now available for the Chevy City Express Compact Cargo van. Choose from steel racks and bins package or the popular SmartSpace Cargo Management system. Upgrade with trade accessories and ladder rack solutions to fit your needs!

Ford Transit

Configure this all-new cargo van to fit all of your full-size van cargo management needs. Custom designed for various packages, the Ford Transit is the solution for 130″ and 148″ wheelbases, ranging from low, medium, to high roofs. Be sure to add accessories that fit your trade.

GM Express / Savanna

Quiet and customizable. The industry’s only all composite and aluminum van interior can be easily adjusted in minutes without tools! SmartSpace shelves are made of rugged components engineered to last in the toughest work environments.

Ram ProMaster

Interior storage systems now available for the Ram ProMaster. Custom designed steel packages are available for 118″, 136″, and 159″ wheelbase vehicles. Then add accessories to fit your trade!

Mercedes Metris

Masterack’s strong and durable steel interiors are designed to handle the toughest applications for the Metris . These high quality, heavy duty interiors have been the number one choice for many commercial fleets

Nissan NV

Masterack’s Nissan NV product line offers shelving that takes advantage of the vehicle’s full cargo capacity. Whether your vehicle is a standard roof or high roof, Masterack has solutions to fit your needs.


Masterack is North America’s leading supplier of high-quality cargo van interiors. You can also specify the same commercial grade equipment for your Sprinter van. Choose from steel, lightweight wire, or SmartSpace® composite shelving. Add vocational upgrades and accessories and customize your Sprinter today.

Truck and Van Bodies

Masterack’s heavy duty steel interiors, used by the nation’s largest fleets, offer maximum durability for the toughest applications. Choose a basic base interior from below to fit your vehicle and upgrade with trade accessories, shelf backs, cabinets, drawers, dividers and bins to meet your needs.