Buyer’s Guide · Water Wells

Crawler vs Truck Mounted Water Well Drilling Rig: 8 Checks

By Windrilling Technical Team · September 2026 · 9 min read

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A driller in Ghana rang me last season with a problem I hear most months. He had bought a truck mounted rig because it moved between villages faster. Then the rains came. His first three sites that season were behind a soft laterite track his truck could not climb.

He hired a crawler rig for six weeks. By the time the ground dried out, the hired machine had drilled the wells his own rig could not reach.

Nothing was wrong with his truck rig. He had bought the right machine for the wrong ground. That is the whole crawler versus truck mounted question in one story: neither mounting is better. One of them is better for the sites you actually have.

I have shipped both configurations for years. Below is how I walk a buyer through the decision, in the order that matters, with the eight checks I use at the end.

1. What Each Mounting Actually Is

People compare the two as if they were different drilling methods. They are not. Both run the same DTH hammer, the same mud pump and the same rod string. The difference is how the rig gets to the hole and how it stands over it.

• Crawler mounted. The rig sits on tracks. It walks into position under its own power, sets up on uneven ground and drills without a truck underneath it. Track machines are slower on the road but they rarely need a road at all.
• Truck mounted. The rig is built onto a truck chassis. It drives itself between sites at highway speed, arrives, and drills off the truck. Fast between jobs, but it needs ground firm enough and flat enough for a loaded truck to stand on.
• Trailer mounted. Usually mentioned in the same breath as truck mounted, but not the same thing. A trailer rig is towed by a separate vehicle, which means one more machine to own and one more thing to maintain — we come back to this in the checks.

So the real question is not which machine drills better. It is which machine fits the sites, the roads and the job sequence you have.

2. Ground and Terrain: Where Each Rig Wins

This is the first question I ask, because it eliminates one option surprisingly often.

• Mud, laterite, sand and slopes. Crawler territory. Tracks spread the load and grip where wheels spin. If your sites are reached by farm tracks that turn to slurry in the wet season, a wheeled chassis will spend the season parked.
• Flat, firm, accessible ground. Truck territory. Village compounds, hard-standing, roadside plots, commercial sites with a gate a truck can drive through. Here a crawler gains nothing and costs you time on every move.
• Mixed ground. Most real programmes. This is where buyers get it wrong, because they buy for the best site instead of the worst one.

One more terrain point that rarely gets mentioned: how the rig stands while drilling. A truck rig drills off its chassis and outriggers, and on soft ground the chassis can settle or tilt as the hole deepens. A crawler sets its own level on the tracks. On a 120 m hole in soft alluvium, that difference shows up in hole straightness.

3. Mobility, Road Speed and the Cost of Moving

Truck mounted wins the road. That is not a small advantage — on a contract with many shallow wells spread over a wide area, moving fast is the difference between a profitable month and a break-even one.

But add up the real move cost before you decide:

• Road time. Truck wins outright. A crawler rig normally travels on a low-loader, so every move is a load, a permit and a hire.
• Site entry time. Crawler wins. It walks in from the gate or straight off a nearby track. The truck needs the last 200 metres to be drivable.
• Ground preparation. Truck rigs may need a rented excavator to level a pad or a haul road built and later repaired. That cost never appears on the rig quotation.
• Weather downtime. In a wet-season market, a truck can lose weeks that a crawler never loses. Lost weeks are the most expensive line in this comparison.

If your sites are on the road network and your crew can plan around weather, the truck’s speed is real money. If your work is rural, spread out and rain-affected, the crawler’s slowness is cheaper than the truck’s downtime. If you want to see how those trade-offs land on real machines, our water well and DTH drilling rig range lists mounting type, depth rating and hole sizes model by model.

4. Depth, Hole Size and Rig Class

Mounting does not set your depth — the rig class does. But it does change which class you can practically carry.

• Shallow domestic and farm wells. Small diameter, 40–120 m. Compact crawler and lightweight truck rigs both work here; this is where the mounting decision matters most and the rig cost matters least.
• Village and irrigation wells. 100–250 mm diameter, 100–250 m. Both configurations are available, but a crawler in this class is usually the better rural machine and a truck the better contract machine.
• Deep or large-diameter work. Heavier masts, bigger pullback, more air. The machine grows beyond what a standard truck chassis carries comfortably, and tracked or self-propelled carriers take over.

Notice the pattern: at the small end the choice is genuinely open, and at the large end it is made for you. Most of the crawler-versus-truck arguments I have online are people in different classes talking past each other.

5. Water, Mud and Site Logistics

The rig is only half the site. How the rest of the package gets to the hole decides whether the mounting you chose actually pays.

• Water supply. DTH work needs little water; rotary and mud drilling needs a lot. If a water truck has to reach the site every day, the road that limits your rig limits your water too.
• Mud and cuttings. Mud systems, tanks and cuttings have to be moved as well. On a truck rig package the support equipment usually rides separately — plan those vehicles into the entry question.
• Compressor and tools. On a DTH job the compressor is often a separate towed unit. A crawler rig may get to site easily while the compressor still has to be dragged there.
• Consumables. Hammers, bits, rods and thread compound all travel with the crew. Keeping a working tools and spares range matched to the rig shortens the days you lose waiting for a part.

6. The Eight Checks Before You Buy

Work through these in order. The first four usually settle the mounting question on their own.

#	Check	What it decides
1	Describe your worst site, not your best one	Ground, slope and access — the single biggest filter
2	Name your wettest month	Whether weather downtime is a real annual cost
3	Measure the distance between jobs and the road class	How much road speed is actually worth to you
4	Decide who owns the low-loader or tow vehicle	Hidden move cost on a crawler or trailer rig
5	Confirm depth, final hole diameter and casing stages	Rig class, mast, pullback and air volume
6	Check the water and mud plan on the furthest site	Whether support equipment can reach you at all
7	Size the crew you can actually employ	A crawler rig takes more setting up; a truck is quicker per stop
8	Measure the distance to your spare-parts source	Downtime cost, which often outweighs the price difference

Back to Ghana. Once we went through these eight, the answer was not “buy a crawler”. It was that his contracts for the next two years were split: wet-season rural work and dry-season village work. The practical answer was a crawler for the rural programme and a hired truck rig for the accessible jobs — which is cheaper than buying the wrong machine and hiring the right one anyway. You can compare the options side by side on our drilling rig range.

Frequently Asked Questions

Is a crawler rig better than a truck mounted rig?

On soft, uneven or rain-affected ground, yes — the crawler gets in and stays level, and it does not care what the track surface looks like. On flat, firm sites connected by real roads, a truck mounted rig is usually the more profitable machine because it moves itself and starts drilling sooner. The honest answer is that it depends on your worst site, not your average one.

Which is cheaper to run?

Compare cost per completed well, not cost per move. A truck rig spends less on transport but may need a pad built, may lose wet-season weeks and may need extra vehicles for its support equipment. A crawler spends more on every move but far less on ground preparation and weather downtime. Add both columns before you compare the two quotations.

What about trailer mounted rigs?

A trailer rig is a good choice when you stay on one site for weeks and already run a suitable tow vehicle. It is a poor choice if every move needs a hire or a second machine, because the trailer’s low purchase price gets eaten by transport. Treat it as a third option, and only after you have answered check four.