Installing a Lay Down Style Auxiliary Tank under a Crossover Toolbox


Adding an auxiliary fuel tank to your fuel tank toolbox combo can significantly extend your range, allowing for longer journeys without frequent refueling stops. If you have a crossover toolbox mounted in your truck bed, you might wonder if it’s possible to install a lay down style auxiliary tank underneath it. This guide will walk you through the process of installing an auxiliary tank in this configuration, maximizing both storage and fuel capacity.

Assessing Compatibility

Before proceeding with installation, it’s crucial to ensure compatibility between your crossover toolbox and the chosen lay down style auxiliary tank. Consider the following:

  • Dimensions: Measure the dimensions of your crossover toolbox and compare them to the available space underneath for the auxiliary tank. Ensure that there is sufficient clearance for installation.
  • Weight Capacity: Check the weight capacity of your truck bed and ensure that it can support the additional weight of the auxiliary tank and fuel.
  • Accessibility: Assess how the installation of the auxiliary tank may affect access to the toolbox and any other components in the truck bed.

Selecting the Auxiliary Tank

Choose a lay down style auxiliary tank that fits comfortably underneath your crossover toolbox while providing the desired fuel capacity. Consider factors such as:

  • Shape and Size: Opt for a tank with a low-profile design that maximizes clearance under the toolbox without sacrificing fuel capacity.
  • Material and Durability: Select a tank constructed from durable materials such as aluminum or steel, ensuring resistance to corrosion and longevity.
  • Capacity: Determine the appropriate fuel capacity based on your range requirements and available space for installation.

Installation Steps

Follow these steps for installing a lay down style auxiliary tank under a crossover toolbox:

  • Clear the Truck Bed: Remove any items from the truck bed and clear the area where the auxiliary tank will be installed.
  • Position the Toolbox: Position the crossover toolbox in the desired location in the truck bed, ensuring that it is securely mounted and level.
  • Prepare for Installation: Measure and mark the location for mounting brackets or straps to secure the auxiliary tank underneath the toolbox. Ensure that the tank will be positioned securely and level.
  • Mount the Auxiliary Tank: Using mounting brackets or straps, securely mount the auxiliary tank underneath the crossover toolbox. Ensure that the tank is positioned to maximize clearance and does not interfere with any other components in the truck bed.
  • Connect the Fuel Lines: Connect the auxiliary tank to your truck’s fuel system using the appropriate fittings and hoses. Double-check all connections to ensure they are tight and leak-free.
  • Test for Functionality: Before hitting the road, conduct a thorough test to ensure that the auxiliary tank is functioning correctly. Check for any leaks or abnormalities and address them promptly.


Installing a lay down style auxiliary tank under a crossover toolbox is a practical way to maximize both storage and fuel capacity in your truck. By carefully selecting compatible components and following proper installation procedures, you can enjoy the benefits of extended range without sacrificing valuable storage space. With the right tools and attention to detail, you can achieve a seamless integration that enhances the functionality and versatility of your truck for any adventure.

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