Gruen RK 250 SONDER
Built: 2018 · Series: Other models
More machines from model year 2018
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Gruen – other models: the collective page of tar and hot-asphalt boiler trailers for road building outside the named ranges, RK and RVK series, 730 to 2,250 kg unladen weight, up to 3,500 kg gross weight
This page gathers the trailers the register lists under the name Gruen outside the named ranges. The model names – Teerkocher, RK and RVK with an attached number for the boiler size – point to road-building trailers used as towed boilers for heating jointing compound and hot-laid asphalt; the RK and RVK ranges differ in boiler size and extra equipment, such as the Sonder suffix on the RK 250 Sonder; the plainly numbered 601 and 901 models denote simpler base versions without this suffix.
Read on 3 more paragraphs
The register lists here 10 versions with unladen weights from 730 to 2,250 kg, gross weights from 935 to 3,500 kg and widths from 1,580 to 2,050 mm.
As towed working equipment rather than classic transport trailers, tar-boiler trailers are common in road and civil engineering, where they bring jointing compound, bitumen or hot asphalt up to working temperature on site; the unladen weight stays deliberately low so that even smaller tow vehicles can bring the equipment to the worksite; heating time also varies with boiler size, which is why construction firms often keep several sizes side by side in their fleet.
When buying used, the condition of the boiler, burner and thermostat matter most, along with the tightness of the welds, the condition of the chassis, brakes and lighting, and the date of the last burner inspection; spare parts for the boiler and burner are available from dealers specialising in bitumen equipment.
Sources: SpecCodex register, model data: Gruen (weitere Modelle)
Technical data
Dimensions and weights
| Width | 2,050 mmcorrect |
|---|---|
| Wheelbase | 3,750 mmcorrect |
| Unladen weight | 1,320 kgcorrect |
| Gross vehicle weight | 2,000 kgcorrect |
Drivetrain and chassis
| Top speed | 100 km/hcorrect |
|---|
Frequently asked questions
How much does the Gruen RK 250 SONDER weigh?
The unladen weight is 1,320 kg.
What is the gross vehicle weight of the Gruen RK 250 SONDER?
2,000 kg.
Up to what speed is the Gruen RK 250 SONDER approved?
Approved up to 100 km/h.
When was the Gruen RK 250 SONDER built?
Production years: 2018.
What to check before buying
- Search the frame and welds at the axle mounts — that is where cracks start.
- Check the brakes and the last inspection in the papers.
- Work the gross weight against the towing vehicle before buying.
- Compare the chassis number with the papers.
- Look at the floor, cover or body from the inside — rust does not show from outside.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 7 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
Sources: RDW — Dutch national vehicle register (retrieved August 2026) · How we check the data
Trailer in 3D section
Turn the model, look inside and click an assembly — each one is explained.
