A tandem truck load is the amount of material a tandem axle dump truck can carry in a single trip, typically 10 to 16 cubic yards depending on the truck and the material being hauled. The “tandem” refers to the truck’s rear axle setup: two axles positioned close together, which distributes weight more evenly and allows the truck to carry heavier loads than a single-axle vehicle. If you’re ordering gravel, dirt, mulch, or sand for a project, a tandem load is one of the most common delivery sizes you’ll encounter.
How Tandem Axles Work
A tandem axle truck has two rear axles instead of one, with both axles sharing the weight of the load. This dual-axle design improves traction, increases stability for tall or heavy loads, and spreads the weight across more tires to reduce road damage. It’s the standard configuration for most full-size dump trucks used in construction, landscaping, and municipal work.
The tandem setup is what separates these trucks from smaller single-axle dump trucks (which carry less) and larger tri-axle trucks (which carry more). When a supplier quotes you a “tandem load,” they’re telling you the truck making the delivery has this two-axle rear configuration and a bed sized to match.
How Much Material Fits in One Load
A standard tandem dump truck holds 10 to 12 cubic yards of material. Some larger models, sometimes called super dumps, can carry 14 to 16 cubic yards. The actual amount you get depends on two things: the physical size of the truck bed and the weight of the material.
A typical tandem dump truck bed is about 17 feet long with side walls around 60 inches high. That’s a big container, but you can’t always fill it to the top. Dense materials like gravel or wet soil hit the truck’s weight limit before the bed is full, while lighter materials like mulch or dry topsoil can fill the bed completely without exceeding weight restrictions.
Here’s what that looks like for common materials:
- Gravel: 10 to 12 cubic yards per load. Gravel is heavy (roughly 2,800 pounds per cubic yard for crushed stone), so weight is usually the limiting factor.
- Topsoil: 10 to 14 cubic yards per load, depending on moisture content. Wet topsoil weighs significantly more than dry.
- Mulch: 12 to 16 cubic yards per load. Mulch is lightweight, so the truck bed fills up before the weight limit becomes an issue.
- Sand: 10 to 12 cubic yards per load. Like gravel, sand is dense enough that weight caps the load before volume does.
Weight Limits That Determine Load Size
Federal law caps tandem axle weight at 34,000 pounds on interstate highways. That’s the weight on the rear axles alone, not the total truck weight. When you add the front axle, the cab, and the truck itself, a loaded tandem dump truck typically has a gross vehicle weight between 50,000 and 58,000 pounds. The truck itself weighs roughly 25,000 to 30,000 pounds empty, leaving around 25,000 to 30,000 pounds of actual payload capacity, or roughly 12 to 15 tons of material.
State and local weight limits vary. Some states allow higher weights on certain roads, while others are stricter, especially on secondary roads or bridges. Haulers know their local limits and load accordingly. If a supplier says a tandem load of gravel is “12 yards,” they’ve already factored in weight restrictions for your area.
Tandem Loads vs. Other Truck Sizes
If you’re comparing delivery options, the tandem sits in the middle of the size range. A single-axle dump truck carries about 5 to 7 cubic yards, roughly half a tandem load. A tri-axle truck steps up to 14 to 16 cubic yards. For very large projects, belly dumps and end dumps (trailer-style haulers) can move 29 to 32 cubic yards in a single trip, and articulated off-road dump trucks carry around 25 cubic yards.
For most residential and mid-size commercial projects, a tandem load is the sweet spot. It’s enough material to make real progress on a driveway, foundation, or landscaping job without requiring specialized equipment or oversized vehicles that may not fit on your street.
What a Tandem Load Costs
Pricing for a tandem truck delivery depends on the material, the distance, and your region. Dump truck hourly rates generally fall between $85 and $130 per hour, with operating costs for the trucking company averaging around $91 per hour. Most deliveries are priced per load rather than per hour, though, so you’ll typically see a flat delivery fee on top of the material cost.
A tandem load of gravel, for example, might cost $300 to $600 total in many markets, with the material making up most of that price and delivery adding $50 to $150 depending on distance. Prices fluctuate by region and season, so getting two or three quotes is worth the effort. Ordering full loads rather than partial ones gives you a better per-yard price since the delivery fee is the same either way.
Estimating How Many Loads You Need
To figure out how many tandem loads your project requires, calculate the total cubic yards of material you need, then divide by the truck’s capacity (use 10 to 12 cubic yards as a safe estimate for dense materials, 12 to 15 for lighter ones).
For a quick reference: one cubic yard covers about 100 square feet at 3 inches deep. So a tandem load of gravel (roughly 10 to 12 cubic yards) covers 1,000 to 1,200 square feet at that depth. If you’re filling a driveway that’s 12 feet wide and 100 feet long at 4 inches deep, you’d need about 15 cubic yards, or roughly one and a half tandem loads.
Suppliers can help with these calculations if you give them the dimensions of the area you’re covering and the desired depth. It’s better to slightly overestimate than to come up short and pay for a second partial delivery.