A truck-mounted crane is a hydraulic loader crane (or larger boom crane) bolted to a commercial truck chassis, with published load envelopes spanning roughly 2 txm on entry-level swing-arm models to 250 t class on 5-axle all-road carriers [S2][S5]. The defining trade-off is mobility versus structural capacity: the same truck axle and driveline that lets the unit drive at 85 km/h on public roads also limits how much counterweight, outrigger span and slewing torque the upper works can carry, which is why a 50 t class compact unit like the Liebherr LTC 1050-3.1E weighs 7 t on the crane side while the Tadano AC 5.250-2 carries an 80 t counterweight stack on a 5-axle chassis [S3][S5].
Buyers should weigh deployment distance, lift frequency, site space and required reach together, not in isolation, because each parameter pushes a different spec lever: short-radius urban work favours compact luffers such as the Gruas Saez SLH 70.4 with a 4 m in-service footprint and 36 m hook height, while long-reach infrastructure lifts sit in the telescopic 30-55 m vertical outreach band typified by the Effer iQ.2255 HP [S1][S4].
Load Class, Reach and Chassis Match
Truck-mounted crane lift envelopes in 2026 spec sheets cluster in three bands: a 2-15 txm light class dominated by swing-arm and folding jibs (Effer 175, Hiab X-CLX 1x8 at 10,100-14,200 kg), a 30-70 t compact class built on 3-axle chassis (Liebherr LTC 1050-3.1E at 50 t max load, 39 m horizontal reach, 48 m working height), and a 100-275 t heavy class on 4- to 5-axle carriers (Tadano AC 5.250-2 at 250 t load, 70 m working height, 390 kW drive) [S2][S3][S5][S6].
Horizontal reach scales with structure: luffing jibs keep a low 4-5 m in-service radius but extend to 35 m when opened (SLH 70.4), swing-arm units trade 8.7-19.9 m working height for fast deployment, and telescopic booms stack both functions at the cost of stowed length and tail swing [S1][S3][S6]. For a deeper taxonomy by structure type, the 2026 spec map of truck-mounted crane types covers swing-arm, folding, telescopic and luffing-jib variants against the same chassis classes.
Mobility, Drive Speed and Site Entry
Public-road mobility is the headline advantage: the Liebherr LTC 1050-3.1E is roadable at 85 km/h with a 243 kW (330 hp) drive engine, letting a single operator drive the crane onto site without a low-loader escort [S3]. Counterweight, boom and outrigger packages fold within typical 12 m / 26 t truck envelopes, which is why fleet buyers in last-mile logistics, utility line work and rental prefer truck-mounted units for jobs under one shift.
Site-entry footprint is the second mobility lever: the SLH 70.4 was explicitly designed for "urban centres where the available space is at a premium" and posts a 4 m in-service / out-of-service radius with no separate tail counterweight swing [S1]. Compare that to a crawler crane's 4-5 m track plus 1 m clearance, and the truck-mounted unit regains roughly one vehicle-width of working room in tight streets, which is the reason aerial work truck and truck-mounted crane fleets dominate urban utility maintenance.
Power Options: Diesel, Electric and Hybrid
Drive concepts are diverging in 2026 spec sheets between conventional diesel-hydraulic and electro-hydraulic hybrids. The LTC 1050-3.1E runs crane movements either from its combustion engine or from a site power feed at 125 A full performance / 63 A and 32 A derated, and is "simply quiet" in electric mode, which is the verbatim OEM claim for "zero emissions" construction sites [S3]. Stored external battery packs are listed as an alternative feed, matching the broader crane industry's transition toward plug-in site power.
Light-class units stay diesel-hydraulic by default, with 24 kW (32.6 hp) electric-motor options on compact luffers such as the SLH 70.4 that are sized for jib hoist (up to 79 m/min) rather than travel drive [S1]. The practical selection rule is duty cycle: continuous lifts over 4 h on a single site justify the electro-hydraulic premium; intermittent daily lifts under 2 h keep diesel-hydraulic in the lead on capex and refuelling logistics.
Structural and Duty-Cycle Limits
The same truck chassis that enables road transit caps structural performance in three measurable ways. First, outrigger span is limited to the truck's frame width plus typical 1.5-2 m jacks, so side-load charts fall off faster with radius than a crawler crane with 5-7 m extended crawlers. Second, the upper works mass is constrained by axle-load regulations, which is why a 50 t class LTC carries 7 t of crane structure while a comparable 50 t crawler carries 35-40 t of upper works for higher-capacity charts. [S3]
Third, slewing and continuous-duty performance drops on long shifts: the SLH 70.4 swing speed is published at 0.8 rpm (5.027 rad/min), and swing-arm units in the 10-15 txm class typically cap hoist duty at 15-20% of a shift before thermal limits engage [S1]. Buyers running two-shift steel erection or wind-turbine erection should run cycle-time math against a crawler crane pros and cons baseline, where crawler units win on cycle time but lose on mobilisation cost.
Cost, Sourcing and Aftermarket
Truck-mounted crane procurement splits into OEM-built units from European brands (Liebherr, Effer, Hiab, Tadano Faun) and chassis-integrated packages from Chinese integrators such as Hubei Shenbai Special Purpose Vehicle, who list "truck-mounted crane / crane truck / refrigerated truck" as a single product family on commercial B2B catalogs [S7]. European OEM list prices run roughly 2-3x the chassis-integrated Chinese equivalent for the same txm class, with the premium funding higher-grade slewing bearings, load-moment indicator (LMI) electronics and EN 13000 / ASME B30.5 compliance documentation.
Total cost of ownership over a 10-year horizon is dominated by chassis depreciation and LMI / outrigger electronics refresh, not by the crane structure itself. For buyers comparing 30 t class truck-mounted versus aerial work platform fleets, the crossover point sits around 60-80 lift-days per year; below that, rental wins; above it, ownership recovers the capex delta in 4-5 years.
Selection Criteria and Comparison Matrix
Four criteria separate the three structural types on a 2026 spec sheet: stowed footprint, peak load, horizontal reach and per-shift cycle time. The trade-off is direct: luffing jibs (SLH 70.4) post 4,000 kg / 35 m reach on a 4 m footprint with low slew speed; swing-arm units (Hiab X-CLX 1x8) cover 14,200 kg / 19.9 m working height with the fastest deployment; telescopic booms (Liebherr LTC 1050-3.1E, Effer iQ.2255 HP) reach 50 t / 39 m at the cost of stowed length and tail swing. [S3]
Who it is for: fleets running under 80 lift-days per year, urban utility crews needing a 4 m in-service radius, and rental yards selling tele and luffing variants alongside dump truck and reach truck categories.
Sourcing, Standards and Risk Map
Compliance documentation differentiates OEM and integrator units: European-built truck-mounted cranes ship with EN 13000 conformity, Machinery Regulation (EU) 2023/1230 declarations, and LMI calibration logs traceable to ISO 4309. Chassis-integrated Chinese units typically ship with GB/T 6067.1 crane safety documentation and CCC vehicle type approval, which is acceptable for domestic China projects but adds an inspection step for EU, North American or GCC deployment. [S7]
Trackable signals for the next 6-12 months: OEM expansion of 125 A electro-hydraulic site-power options into the 30-80 t compact class, growth of LMI telematics retrofit kits for 10-15 year-old truck-mounted fleets, and gradual tightening of urban low-emission zones that will shift spec weight toward the LTC-style electric upper works. Buyers should pin the next truck-mounted crane installation guide review to chassis-axle load math before signing any 2026-Q3 order, and run cycle-time and total-cost checks against the crawler crane total cost of ownership baseline for any 100 t+ class lift.