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Understanding the Basics
Lowboy (Lowbed/Double Drop)
Designed for tall, top-heavy equipment with a recessed well that provides low center of gravity and maximum height clearance.
Best for: Excavators, dozers, pavers, any equipment over 10'2"
Step Deck (Drop Deck)
Two-level design offering extended deck space while maintaining reasonable height limits for versatile hauling.
Best for: Long loads, mixed freight, equipment under 10'2"
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 shorter deck space
Step Deck Capacities
- 2-axle: ~48,000 lbs
- Tri-axle: 60,000+ lbs
Best for: Longer, distributed freight loads
Load Distribution
Weight distribution efficiency varies significantly between trailer types based on load characteristics.
DOT Heights & Permit Requirements
Height Regulations
Most states limit total vehicle height to 13'6"-14'0". Exceeding these limits requires overheight permits and potentially pilot cars.
Permit Basics
- Cost: $15-$75 per permit
- Processing: 24-72 hours
- Requirements: Route-specific
Always verify current regulations with your state DOT before transport.
Height Calculator
Real-World Applications
Construction
Lowboy: Excavators, dozers, pavers, rollers
Step Deck: Backhoes, skid steers, mixed materials
Agriculture
Lowboy: Combines, tall harvesters
Step Deck: Tractors, implements, supplies
Industrial
Lowboy: Compressors, generators, drilling equipment
Step Deck: Long skids, pipe, modular components
Investment Analysis & Total Cost of Ownership
Purchase Prices
| 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
- Factors: Location, season, specifications
Rentals are ideal for seasonal or occasional use
Need to rent instead of buy?
Explore Rental OptionsAnnual 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 is approximately $300 (including depreciation, financing, insurance, and maintenance). If local rental rates average $225/day, ownership becomes cost-effective above 150 days of annual use.
Loading Methods & Safety Protocols
Lowboy Loading
- RGN/detachable neck enables low-angle drive-on
- Lower center of gravity improves stability
- Front loading reduces ground pressure
Step Deck Loading
- Rear ramps or dock-level loading
- Better ground clearance over rough terrain
- Forklift and crane accessibility
Safety Checklist
- Verify securement points and chain ratings
- Check route restrictions and bridge clearances
- Re-measure height after loading
- Inspect tie-downs before departure
- Plan for pilot car requirements
Route Planning Essentials
Always verify bridge heights, construction zones, and time restrictions before transport. Some routes may have seasonal restrictions or require specific permits for oversized loads.
Making the Right Choice
Choose Lowboy When:
- 60%+ of loads exceed 10'2" height
- Hauling concentrated heavy equipment
- Frequent transport of tall machinery
- Need front drive-on capability
- Stability is critical for top-heavy loads
Choose Step Deck When:
- Most loads under 10'2" height
- Need extended deck length
- Hauling mixed/distributed freight
- Require dock-level loading
- Want maximum versatility
Still Unsure? Take Our Interactive Quiz
Answer a few questions about your hauling needs and get a personalized recommendation.
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, latest safety features, and 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.
Ready to Make Your Decision?
Our trailer specialists can help match the right equipment to your specific hauling needs and budget.
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