Both fuel transfer tanks and auxiliary tanks are typically made from aluminum or steel. Steel provides the utmost strength and durability throughout travels, but it also weighs more. This could be something to factor in if you’re conscious of your vehicle’s weight or towing capacity. Steel is also vulnerable to rust and corrosion in wet or salty environments. Their endurance can be improved by protective coatings, such as a powder coat finish. On the other hand, aluminum tanks are lightweight, naturally corrosion-resistant, and heat-dissipating, which reduces overheating. The tradeoff is that aluminum is less durable, making it more prone to damage upon impact. For the best of both worlds, there’s a little something called aluminized steel. Fuel tanks with aluminum-plated steel offer protection from moisture, heat, and collisions, all in one glorious tank.