Answering the question of which auxiliary fuel tank combo is best for rugged use, performance, and value. These kits combine a transfer tank with a toolbox for extra storage, ideal for long trips, remote work sites, and fleet maintenance. The top picks below target buyers seeking durable steel or aluminum builds, integrated tool storage, and reliable fuel transfer capability. The best for different needs are noted alongside each entry to help you decide quickly.
Buyer summary table
| Product | Best For | Capacity |
|---|---|---|
| RDS 71789 Rectangular Combo | All-around utility with fuel transfer and tools | 51 gallons |
| Dee Zee DZ92647SB 92 Gal Combo | Heavy-duty storage and large capacity | 92 gallons |
| RDS Fuel Transfer/Aux Tank 60 Gal with 8 GPM | Fast transfers and practical capacity | 60 gallons |
| RDS 72548 Fuel Transfer Tank/Toolbox Combo | Compact MFG option with US origin | 60 gallons |
| Dee Zee DZ92740B 43 Gal Aluminum Combo | Lightweight aluminum option | 43 gallons |
RDS MFG INC RDS 71789 Rectangular Combo Fuel Tank and Tool
The RDS 71789 is a rectangular auxiliary fuel tank and toolbox combo designed for versatile truck use. It emphasizes capacity and integrated storage, suitable for contractors and long-haul drivers who need fuel alongside common tools. Best for: buyers who want a single, compact setup that combines fuel storage with tool organization.
Why selected: It offers a 51-gallon capacity in a compact rectangular footprint, with the option to siphon gasoline from the top using an electric pump, which simplifies refueling in remote jobsites. Caution: The setup relies on proper mounting and electrical connections for the pump, so installation complexity may be higher for DIY setups.
Dee Zee DZ92647SB 92 Gallon Black Steel Combo
The DZ92647SB is a substantial steel combo tank and toolbox with the emphasis on heavy-duty storage and corrosion resistance. Best for: owners who prioritize maximum capacity and weatherproof steel construction for challenging environments.
Why selected: Includes added storage bolted onto the transfer tank and advanced corrosion protection through NRT powder coating. Caution: The package uses a thick steel build, which increases weight and may require robust mounting hardware for secure installation.
RDS Fuel Transfer/Aux Tank/Toolbox Combo with 8 GPM Pump
This RDS combo emphasizes faster fuel transfer with an 8 GPM pump, paired with a toolbox for organized supplies. Best for: users who need quicker refueling to minimize downtime during remote work or travel.
Why selected: The combination of a 60-gallon capacity and a relatively high-flow pump supports steady, speedy transfers. Caution: Ensure the pump and lines are properly rated for the intended fuel type and that venting is addressed to prevent pressure buildup.
RDS MFG INC – 72548 Tank/Toolbox Combo
The 72548 offers another 60-gallon option from MFG INC with a focus on auto accessory compatibility and straightforward dimensions for fitment in standard truck beds. Best for: buyers seeking a US-origin product with predictable dimensions for planning installations.
Why selected: It lists clear package dimensions and origin, which helps with budgeting space and compliance. Caution: Specific pump flow and included hardware are not stated, so verify compatibility before purchase.
Dee Zee DZ92740B 43 Gallon Aluminum Combo
The DZ92740B is the lighter aluminum option, offering a 43-gallon capacity with aluminum construction for weight savings. Best for: buyers prioritizing lighter weight and corrosion resistance with adequate fuel volume.
Why selected: Aluminum construction reduces vehicle load compared to steel while maintaining functional transfer capability. Caution: The lower capacity means more frequent refueling on long trips compared with larger tanks.
Buying Guide
What to consider when choosing an auxiliary fuel tank combo:
- Capacity: Choose based on typical travel distance and fuel economy. Larger tanks reduce refueling stops but add weight and may affect handling.
- Material: Steel offers durability and extra protection; aluminum saves weight and resists corrosion. For rugged environments, steel is often preferred; for lighter weight, aluminum is ideal.
- Integrated toolbox: If you need on-board storage for tools, select a model with a toolbox integrated into the tank. Ensure the toolbox is accessible and secured.
- Pump and transfer rate: A higher GPM pump transfers fuel faster, reducing downtime. Confirm compatibility with the tank’s fittings and the vehicle’s electrical system.
- Dimensions and mounting: Check fitment with your truck bed or trailer. Verify clearances for hoses, vents, and mounting hardware.
- Ventilation and safety: Ensure proper venting and check for any mounting clearance to avoid contact with hot engine components or exhaust paths.
- Warranty and origin: US-origin products can simplify service and compatibility concerns. Review mounting hardware and included components to avoid missing items.
Frequently Asked Questions
- What is an auxiliary fuel tank combo best used for?
They are designed to extend range for trucks and RVs by adding both extra fuel storage and, in many cases, on-board tool storage for work-site convenience.
- What should I consider when selecting capacity?
Consider driving distance between refuels, fuel efficiency, and the weight load you can safely carry without impacting vehicle handling.
- Is aluminum or steel better for durability?
Steel tends to be more durable in rugged conditions; aluminum is lighter and resists corrosion but can be less robust in heavy-duty impacts.
- Do these combos include installation hardware?
Hardware availability varies by model; verify with the seller or product listing to ensure you have the necessary mounting and pump components before purchase.
- Can I siphon fuel from the top of the tank?
Some models offer top-siphon capability with an electric pump, but always follow safety guidelines and local regulations when transferring fuel.
- What is a typical transfer pump rating to look for?
A higher GPM rating means faster transfers; choose a rating that aligns with your refueling pace and hose routing capabilities.