Step Deck Trailers for Heavy Equipment: When They're the Right Choice

What Is a Step Deck Trailer?

A step deck trailer — also called a drop deck or single-drop trailer — features two deck levels: a short upper deck behind the gooseneck (approximately 10–11 feet long, sitting 60 inches off the ground) and a longer lower deck (approximately 30–43 feet long, sitting 42 inches off the ground). This two-level design gives the lower deck 18 inches more vertical clearance than a standard flatbed, allowing taller equipment to be transported legally without the complexity and cost of a lowboy.

Step Deck Specifications

Specification	Standard Step Deck
Total Length	48–53 feet
Upper Deck Length	10–11 feet
Lower Deck Length	30–43 feet
Upper Deck Height	60 inches (5 ft) from ground
Lower Deck Height	42 inches (3.5 ft) from ground
Width	8 ft 6 in (102 inches) standard legal
Payload Capacity	43,000–48,000 lbs
Max Legal Load Height (lower deck)	10 feet (to stay under 13'6" total)

When a Step Deck Is the Right Choice

Equipment That's 8'6" to 10' Tall

This is the step deck's sweet spot. Equipment in this height range is too tall for a standard flatbed (which would put the load over the 13'6" legal height limit) but doesn't need the extreme low deck of a lowboy. Common examples:

• Forklifts: Most warehouse and industrial forklifts (5,000–30,000 lb capacity) are 7–9 ft tall with mast lowered — a perfect fit for a step deck.
• Skid steer loaders: Compact track loaders and skid steers are typically 6–8 ft tall — step deck works well.
• Compact excavators (under 10 tons): Mini and compact excavators with boom lowered are often 8–9 ft tall — step deck is appropriate.
• Telehandlers: Most telehandlers are 8–9 ft tall in transport position — step deck is the standard choice.
• Agricultural equipment: Tractors, combines, and implements often fit on a step deck.

Equipment Under 48,000 lbs

The step deck's payload capacity of 43,000–48,000 lbs covers a wide range of construction and industrial equipment. If your machine weighs more than 48,000 lbs, you'll need a lowboy or RGN with higher payload capacity.

Equipment That Needs Ramp Loading

Step decks can be equipped with ramps for drive-on loading of wheeled equipment. This is an advantage over fixed-neck lowboys, which require cranes or forklifts for loading. If your equipment is wheeled and self-propelled, a step deck with ramps may be more practical than a lowboy.

When a Step Deck Is NOT the Right Choice

Equipment Over 10 Feet Tall

If your equipment is taller than 10 feet in transport position, a step deck will put the load over the 13'6" legal height limit, requiring an overheight permit. At that point, a lowboy or RGN (with a deck height of 18–24 inches) is the better choice — it provides 18–24 more inches of clearance, keeping more loads within legal height limits.

Equipment Over 48,000 lbs

Step decks are rated for 43,000–48,000 lbs payload. Heavier equipment requires a lowboy or RGN. A 3-axle RGN handles up to 52,000 lbs; a 5-axle RGN handles up to 90,000 lbs.

Tracked Equipment That Can't Use Ramps

Tracked equipment (excavators, dozers, crawlers) that is too heavy or too large to safely use step deck ramps is better suited to an RGN, which allows the machine to drive directly onto the trailer via the detachable gooseneck.

Step Deck vs. Lowboy: Cost Comparison

Step decks are generally less expensive than lowboys for loads that fit within step deck parameters:

• Step deck rates: Typically $2.00–$4.00 per mile for standard loads
• Lowboy rates: Typically $2.50–$5.50 per mile due to specialized equipment and permit complexity
• Permit costs: Step deck loads that stay within legal height limits avoid overheight permits, saving $200–$800 per state

If your equipment fits on a step deck within legal limits, choosing a step deck over a lowboy can save $500–$2,000 on a typical interstate move.

Oversize Permits for Step Deck Loads

Even on a step deck, oversize permits may be required if:

• Equipment width exceeds 8'6" (oversize width permit required)
• Equipment height on the lower deck exceeds 10 ft (overheight permit required)
• Total GVW exceeds 80,000 lbs (overweight permit required)

IronHaul handles all permit procurement as part of the transport quote — you don't need to manage state DOT portals.

Not sure whether your equipment needs a step deck, lowboy, or RGN? IronHaul Logistics will evaluate your equipment's dimensions and weight and recommend the right trailer for the job. Get a quote at ironhaullogistics.com, call (208) 495-2260, or email [email protected].