Common use of Fuel Tank Truck is to deliver fuel such as liquified petroleum gas (LPG) to households, commerces and industries. The smallest of these trucks usually carry about 1,000 US gallons (3,800 L; 830 imp gal) of LPG under pressure. Typically LPG tank trucks carry up to 3499 US gallons of product (usually liquid propane), on a 2 axle bobtail truck. 3500 US gallons (13,200 L; 2,900 imp gal) and greater requires a 3 axle truck (tank wagon). Some companies are using lightweight steel to carry more gallons on single-axle trucks.