Understanding the basics
Lowboy (lowbed / double drop) — Features a recessed well designed to accommodate tall, top-heavy equipment while maintaining legal height clearance. Well depth ranges from 18–24 inches, with legal heights up to 11'6" and well lengths spanning 24–29.6 feet. Ideal for excavators, dozers, pavers, and equipment exceeding 10'2". For the full spec breakdown, see our guide to lowboy dimensions and weight.
Step deck (drop deck) — A two-level design offering extended deck space while respecting height restrictions. Features deck heights of 36–42 inches, legal heights around 10'2", and deck lengths between 37–43 feet. Better suited for long loads, mixed freight, and equipment under 10'2".
If you are still narrowing down the category itself, our guide to the types of commercial trailers sorts the whole lineup by the job it does.
Quick decision rule: If more than 60% of your loads exceed 10'2" in height, choose a lowboy. Otherwise, a step deck offers more versatility for daily operations.
Side-by-side specifications
Specification | Lowboy | Step Deck |
|---|---|---|
Deck / well height | 18–24" (recessed well) | Lower: 36–42", Upper: ~60" |
Primary deck length | Well: 24–29.6 ft | Lower deck: 37–43 ft |
Standard width | 8'6" (102") | 8'6" (102") |
Max legal cargo height | Up to 11'6" | ~10'2" |
Loading method | RGN front drive-on | Rear ramps, dock loading |
Permit frequency | Lower for tall loads | Higher for tall loads |
Weight capacity & axle configurations
Lowboy capacities
- 2-axle: ~40,000 lbs
- 3-axle: 60,000–80,000 lbs
- Multi-axle RGN: 80,000–150,000+ lbs
Best for concentrated heavy loads in a shorter deck space.
Step deck capacities
- 2-axle: ~48,000 lbs
- Tri-axle: 60,000+ lbs
Best for longer, distributed freight loads.
Federal weight limits
- Maximum gross: 80,000 lbs (truck + trailer + load)
- Typical payload: 43,000–48,000 lbs after truck/trailer weight
- Axle limits: 12,000 lbs steer, 34,000 lbs tandem drive
Distribute weight evenly across all axles, keep loads low and centered for an optimal center of gravity, and never exceed individual axle limits.
DOT heights & permit requirements
Most states limit total vehicle height to 13'6"–14'0". Exceeding these limits requires overheight permits and potentially pilot cars.
- Standard permit cost: $15–$75 per permit, processed in 24–72 hours, route-specific.
- Permits required when total height exceeds 13'6" (most states).
- Permits required for overweight loads above 80,000 lbs or widths exceeding 8'6".
Important: Always verify current regulations with your state DOT before transport.
Real-world applications
Construction — Lowboy: excavators (tall cabs), bulldozers, road pavers, compacting rollers, large cranes. Step deck: compact backhoes, skid steers, material bundles, small tools, prefab building components.
Agriculture — Lowboy: combine harvesters, large high-cab tractors, tall balers, cotton pickers, self-propelled sprayers. Step deck: compact tractors, disc harrows and plows, seed drills, feed mixers, agricultural supplies.
Industrial — Lowboy: large compressors, industrial generators, drilling equipment, heavy pumps, tall processing equipment. Step deck: long steel skids, pipe sections, modular components, machinery parts, industrial supplies.
Investment analysis & total cost of ownership
Type | Standard range | Heavy-duty range |
|---|---|---|
Lowboy | $85,000 – $140,000 | Up to $250,000 |
Step Deck | $65,000 – $95,000 | Up to $150,000 |
Daily rental rates
- Lowboy: $200–$600/day
- Step deck: $150–$400/day
- Rates vary by location, season, and specifications.
Here's the part the spec charts skip: on Western's own yard a heavy-haul lowboy carries a real price premium over a comparable step deck. A new XL Specialized lowboy runs around $120,000, while our step decks sit in the flatbed inventory at meaningfully less for most configurations — the premium buys you the low, recessed well and the detachable neck. Prices move with stock, so check live inventory for today's numbers before you budget.
Not ready to own for 150+ days a year? explore trailer rentals and run the numbers before you buy.
Annual ownership costs
- Insurance: $1,500–$3,000/year
- Maintenance: $2,000–$5,000/year
- Tires: $3,000–$6,000 every 2–3 years
- Storage: $600–$2,400/year
ROI break-even example — For a $120,000 lowboy used 150 days/year, daily ownership cost approximates $300 (including depreciation, financing, insurance, and maintenance). If local rental rates average $225/day, ownership becomes cost-effective above roughly 150 days of annual use.
Loading methods & safety
Lowboy — RGN loading — A detachable neck enables low-angle drive-on access, a lower center of gravity improves transport stability, and front loading reduces ground pressure damage. Ideal for heavy, self-propelled machinery with minimal ground preparation.
Step deck — ramp loading — Rear ramps provide easy drive-on access for most equipment, with dock-level loading and better ground clearance over rough terrain. Versatile for forklift, crane, and mixed-cargo loading.
Safety checklist
- Verify securement points and chain ratings.
- Check route restrictions and bridge clearances.
- Re-measure height after loading and inspect tie-downs before departure.
- Plan for pilot car requirements where needed.
RGN vs. step deck: a direct comparison
People searching "RGN vs. step deck" are usually deciding between two very different ways to get a machine on the deck. An RGN is a lowboy where the neck detaches and drops so equipment drives straight onto a low, recessed deck. A step deck keeps a fixed frame and loads over rear ramps onto a deck about three feet up. That single difference drives how you load — which is what this section covers. (The height, capacity, and deck-length numbers are in the comparison table and cost sections above.)
Loading. The RGN's detached neck makes a low, gentle ramp right at ground level — a dozer or excavator drives on with minimal approach angle and no cribbing. A step deck loads up its rear ramps, which is quick for rubber-tired and compact equipment but a steeper, higher climb for heavy tracked machines.
Neck mechanics. On an RGN the neck detaches (hydraulic or mechanical) and lowers to the ground so the front of the well opens for drive-on; you reconnect and lift before rolling. A step deck's neck is fixed — nothing to detach — so loading always happens over the rear ramps. That's the real day-to-day difference between the two: front drive-on at ground level versus a rear-ramp climb.
RGN Lowboy | Step Deck | |
|---|---|---|
Loading | Detach neck, front drive-on at ground level | Rear ramps, ~36–42" deck |
Best for | Tall/heavy self-propelled machines (dozers, excavators, pavers) | Freight, steel, pallets, equipment under 10'2" |
Buy it when | You regularly haul tall, heavy iron and need easy drive-on | Most loads clear 10'2" and you want length + versatility |
Bottom line: if the machine is tall, heavy, or self-propelled and you load it yourself, the RGN's drive-on pays for itself. If your loads clear 10'2" and you value deck length and quick ramp loading, the step deck is the more versatile daily trailer. Western stocks RGN lowboys from XL Specialized, Alpha, and Choice, and sells step decks — tell us what you haul and we'll spec the right one.
"I delt with Wes at Western truck & trailers and he was amazing helped me with all my needs and I bought a 53’ step deck"
▎ — Corey W., Western Truck & Trailer customer (Google review, Belgrade, MT)
Making the right choice
Choose a lowboy when
- 60%+ of loads exceed 10'2" height.
- You haul concentrated heavy equipment or top-heavy machinery.
- You need front drive-on capability and maximum height clearance.
When a lowboy is the call, browse our lowboy trailers for sale across our four yards.
Choose a step deck when
- Most loads are under 10'2" height.
- You need extended deck length for mixed or distributed freight.
- You want dock-level loading and maximum versatility.
Weighing a step deck against a flatbed rather than a lowboy? That comparison is here.
Frequently asked questions
Most states allow 13'6" total height, with some permitting up to 14'0". Check your specific state DOT website for current regulations and oversize permit requirements, as these can vary by route and jurisdiction.
Likely yes. Step deck legal cargo height is approximately 10'2", so a 10'10" machine would exceed standard limits. A lowboy might keep you under permit requirements for this height.
Yes, a tri-axle step deck can typically handle 60,000+ lbs depending on specifications. Always verify the exact weight rating on the trailer's VIN/data plate and ensure proper load distribution.
RGNs are valuable when you frequently need front drive-on loading, lower approach angles, and maximum cargo height clearance. They're especially beneficial for dozers, excavators, and pavers that are difficult to load from the rear.
New trailers offer warranties, the latest safety features, and a known maintenance history but cost 30–50% more. Used trailers provide immediate availability and lower cost but require thorough inspection for wear, structural integrity, and remaining service life.
Buy an RGN lowboy if you regularly haul tall or heavy self-propelled equipment and want low, front drive-on loading with up to about 11'6" of legal cargo height and 80,000-lb-plus capacity. Buy a step deck if most of your loads clear 10'2", you want more usable deck length, and you load over rear ramps. The RGN moves the tall, heavy iron; the step deck is the more versatile everyday trailer.
