Komatsu HD785 Mining Haul Truck Transport

Background: Mining Equipment Relocation in the Energy Sector

Mining haul trucks — the off-highway giants that move ore, coal, and overburden at extraction sites — are among the heaviest pieces of equipment R&RM LLC regularly transports. The Komatsu HD785-7 is a production workhorse in coal and hard-rock mining, with a rated payload capacity of 91 short tons and a fully loaded operating weight approaching 340,000 lbs in service. For highway transport, these machines are prepared differently than smaller equipment: the dump body is removed and shipped separately, all fuel and fluids are drained, and remaining subassemblies are inspected for width and height in transport configuration.

This project originated from a mine closure in the Powder River Basin region of Wyoming, where a contractor was relocating haul truck assets to a surface operation in the Texas Gulf Coast area. R&RM LLC was engaged to transport the primary truck frame and chassis — the heaviest single component — while coordinating the concurrent move of the disassembled dump body on a separate flatbed load.

R&RM LLC has been moving mining equipment and overweight loads since 2011. Superload transport — which in most states means any load exceeding 16 feet wide, 14 feet tall, or 200,000 lbs — requires a different level of permit and logistical coordination than standard oversize freight. This case study documents how we approached the HD785 move from planning through delivery.

The Challenge

At 130,000 lbs and 14 feet wide, the HD785-7 chassis qualified as a superload in Wyoming and Colorado — triggering requirements for engineering review, specific travel windows, and mandatory escort vehicle configurations that standard oversize permits do not require. Three distinct challenges defined this move:

Superload Classification in Wyoming and Colorado

Wyoming's Wyoming Department of Transportation (WYDOT) classifies loads exceeding 14 feet wide or 125,000 lbs as superloads, requiring application review by the WYDOT Permits Office. Colorado's Colorado Department of Transportation (CDOT) imposes similar thresholds. Both states required our carrier to provide a certified axle weight distribution analysis demonstrating that no single axle group would exceed posted bridge formula limits on the permitted route.

Wyoming also requires a Notice of Movement — a formal advance notification to highway patrol and relevant county sheriff offices — for superloads operating on state highways. Coordinating that notification window with the pickup date at the mine site required careful scheduling to prevent delays at origin.

Mountain Terrain: Raton Pass

The route from Colorado into New Mexico crosses Raton Pass, elevation 7,834 feet, on I-25. The grade on the New Mexico side reaches 6 percent — a meaningful concern for a tractor pulling 130,000 lbs on a 7-axle trailer. We evaluated two alternative routes: dropping south to US-160 through Walsenburg and Trinidad (avoiding the steepest grade segments) versus the direct I-25 corridor. After reviewing the road condition reports and confirming the tractor specification for the load, we proceeded via I-25 with pre-planned pullout points and required the driver to perform brake checks at designated intervals before the descent.

Houston Delivery Routing

The destination facility was located on the outskirts of the Houston metro area — a region with extensive truck-restricted routes, low bridge underclearances on secondary roads, and weight-posted local streets. Texas Department of Transportation (TxDOT) permits specify the route to the nearest state highway intersection, but the final mile to the facility required coordination with local county officials to confirm the specific access road was appropriate for the loaded trailer weight. We requested an advance bridge clearance check from the county engineer's office before finalizing the permit application.

Our Solution

Equipment Assessment and Trailer Selection

The HD785-7 chassis in transport configuration measured 14 feet wide and 12 feet 6 inches tall at the cab. Length of the chassis without dump body was 28 feet. This dimensional profile fit within a 7-axle lowboy configuration — a primary trailer with two 4-axle axle groups plus a 3-axle jeep — which distributed the 130,000 lb load across enough axles to satisfy bridge formula requirements on the permitted route.

We opted against a hydraulic platform trailer for this move, as the HD785 chassis dimensions were within the capacity of a conventional multi-axle lowboy configuration. Hydraulic modular trailers would have added significant cost and lead time without providing a technical advantage for this load profile. Our overweight load transport approach always begins with the most practical trailer configuration that satisfies the permit requirements.

Permit Applications: Four States

Permit applications were submitted sequentially based on anticipated travel dates, working backward from the required delivery window:

• Wyoming (WYDOT): Superload permit with certified axle load distribution analysis. Required 5 business days processing. Travel limited to daylight hours only; no travel permitted on Sundays or state holidays. Front and rear escort required.
• Colorado (CDOT): Superload permit with engineering review. Required 10 business days processing. Travel restricted to 30 mph on grades above 4 percent. Front and rear escort required. CDOT also required a radio-equipped pilot vehicle in communication with the driver at all times.
• New Mexico (NMDOT): Oversize/overweight single-trip permit. Width restriction triggered rear escort only. New Mexico DOT permit window: 6:00 AM to 30 minutes before sunset, no travel on Sundays.
• Texas (TxDOT): Oversize/overweight single-trip permit. Texas required a 72-hour advance notice filing for loads exceeding 110,000 lbs. Rear escort only. Travel hours: one hour before sunrise to one hour after sunset, no travel on Sundays.

Total permit lead time from initial application to all four permits in hand was 14 business days. This timeline determined the pickup window at origin, which we coordinated with the mine site shutdown team.

Escort Vehicle Coordination

Wyoming and Colorado required front and rear pilot cars meeting each state's specific certification requirements. Wyoming requires pilot car operators to hold a current Wyoming Pilot Car Certification; Colorado requires Colorado-certified pilots on loads classified as superloads. We arranged certified pilots through our permit and escort coordination service, confirming certifications in advance and briefing all pilots on the route, rest stop locations, and communication protocols before the move began.

For the New Mexico and Texas segments, a single rear escort vehicle was sufficient. The same rear pilot car operator was qualified in both states and traveled the full southern leg of the route.

Route and Travel Planning

The approved route followed I-25 south from Gillette through Cheyenne and Denver into Colorado, continuing south through Pueblo and over Raton Pass into New Mexico, then through Albuquerque and south on I-25 to El Paso, where the route transitioned to I-10 east into Texas and ultimately north to the Houston area destination. Overnight stops were planned at staging areas outside Cheyenne, Albuquerque, and San Antonio — all with sufficient pull-off space for the loaded trailer and confirmed in advance with each state's Permits Office.

We also coordinated with WYDOT's 511 system to monitor road conditions on the Wyoming segment and arranged for a weather hold contingency at the Cheyenne staging point in case of late-season winter weather on the Colorado mountain segment.

Execution and Delivery

The HD785-7 chassis was loaded at the mine site using site equipment — a heavy lift crane lowered the chassis onto the trailer deck after the dump body and ladder assemblies were removed. Our driver performed a pre-departure inspection confirming all securement chains and binders were in compliance with FMCSA requirements for the load category. The front pilot car led the convoy out of the mine access road and onto the state highway system.

The Wyoming segment proceeded without incident. At the Colorado state line, the certified Colorado pilot cars took over the front escort. The Raton Pass crossing was completed during mid-morning hours with favorable weather and road conditions. The New Mexico pilot car picked up at the state line near Raton, and the Texas pilot car joined at the El Paso entry point.

The final delivery to the Houston-area facility required a brief hold at the county road access point while the facility's receiving crew confirmed the unloading area was ready. The truck was offloaded with facility-provided equipment and placed in the designated staging yard.

Total transit time: 7 days from mine site departure to delivery. The project met the client's required delivery window, and the load arrived with no damage and full regulatory compliance across all four states.

Results

• Delivery: On time and within the client's project schedule
• Compliance: Full compliance with all four state superload and overweight permit requirements
• Safety: Zero incidents, violations, or enforcement stops across all four states
• Condition: Equipment arrived undamaged and ready for site commissioning
• Coordination: Dump body flatbed load completed concurrent delivery on the same day

Key Takeaways for Mining Equipment Transport

Superload moves require permit lead times that standard oversize freight does not — plan for a minimum of two weeks for multi-state superload permit processing, and longer if any state in the route has review backlogs or requires engineering study. Informing your carrier of the intended move date well in advance of the actual need date is the single most effective way to avoid schedule risk on these projects.

Trailer selection matters. For mining haul truck chassis in the 100,000 to 150,000 lb range, a multi-axle lowboy configured correctly for the load profile will almost always be the most cost-effective and fastest solution. Hydraulic modular equipment has its place — for truly extreme loads or unusual geometries — but it adds cost, booking lead time, and complexity that most haul truck chassis moves do not require.

State-by-state escort requirements for superloads vary significantly. What qualifies a pilot car operator in Wyoming is not automatically valid in Colorado or New Mexico. A carrier unfamiliar with these distinctions can delay a move at a state line when the pilot car credentials do not satisfy the next state's requirements. R&RM LLC pre-confirms all pilot car certifications before a convoy moves.

If you need to transport mining haul trucks or other heavy equipment across state lines, contact us to discuss permit timelines, trailer options, and how we approach superload coordination from origin to delivery.