Software for the yard running tank trailers.

A tank trailer is the rental yard's answer when liquid has to move, not just sit — water and brine to a pad, acid to the rig, crude and produced water off a lease, food-grade and chemical loads for a plant. It is a stainless or coated shell on a highway trailer, with baffles inside, a relief and vapor system up top, a discharge and a pump at the bottom, and a DOT rating that decides what it can legally haul. What makes a tanker hard to run as a fleet is that the last load governs the next one, the unit racks up road hours and pump time fast, and the real risk hides inside the tank between products. The standby hours have to land on the invoice, and the wash-out has to be caught at return. EquipFlow runs tank trailers the way the yard that built it does — dispatch, billing, maintenance, and return inspection on one record per unit.

Built inside Rental King, right now.

Rental King is a heavy-equipment rental yard in Odessa and Midland, TX. They run tank trailers, manlifts, forklifts, light towers, generators, compressors, and water trucks on MSA contracts through the Permian Basin — 24/7, oilfield pace. EquipFlow was designed and first deployed inside that yard. Every feature was tested against their live operation before it shipped. The product runs there today.

Tank trailers are high-utilization, high-liability units, and that mix is where a yard leaks money and invites trouble. A tanker staged on an MSA job earns nothing extra if the standby hours never reach the invoice, and it loses twice when it comes back with a heel of product the yard pays to clean without charging it back. Worse, a wrong last-contained-product note can put the next load in a tank that is not safe for it. So the things that decide profit and safety on a tanker — time, wash-out, and product history — all have to be captured the same way every time, against the rental, with photos. When dispatch, billing, maintenance, and inspection read from one unit record, the dispatcher assigns a clean tank to the right load, the bookkeeper closes the month with the standby hours already on it, and a cleaning charge has evidence behind it instead of an argument.

Tank Trailer specs the rental record tracks.

Every number below is a sourced specification range. The render layer is the only path these values reach the page — they live on the unit record, not in a dispatcher's head.

Tank capacity

3500-9500gal

Max allowable working pressure (MAWP)

25-40psi

Tank shell thickness (316L stainless)

0.130-0.140in

Net payload capacity

49975lb

Axle rating (per axle)

22500lb

Max product temperature

300F

Periodic external visual inspection interval

12mo

How EquipFlow handles tank trailers on the dispatch board.

A tank trailer earns by hauling, so the dispatch board treats it as a running cycle, not a set-and-leave asset: which tank is loaded, which is empty and headed back, which is staged on a job, and which is due for the next run. The tractor and the trailer are separate lines, since the same trailer pairs with different power as drivers rotate. The trap with a tanker is the product itself — the last load decides the next one. A tank that carried acid cannot go straight to water, and a food-grade unit cannot haul chemical, so the dispatcher confirms the last-contained product and the wash-out status on the rental record before the trailer is assigned. The board surfaces overlapping windows so a tanker promised to two jobs in the same shift gets caught at assignment, not at the gate, and flags a unit that still needs a wash-out before it can take the next product.

Billing tank trailers — MSA, standby, and site-level tax.

Tank trailer money comes two ways — per load on a hauling run, or per day and per week when a tanker is staged on a job — and both belong on the same invoice. Most oilfield and plant demand is MSA-contracted, so the negotiated rate lives on the customer record per tank class, and a rental created for that account applies it without the dispatcher keeping a rate sheet in their head. Standby is constant here: a loaded tanker sits staged on a pad through a frac delay, a permit hold, or a slow turn at the disposal gate, earning a standby rate distinct from active hauling, and the dispatcher marks it so the invoice carries both lines. Wash-out and cleaning fees, demurrage on a held trailer, and delivery and pickup charges ride the same invoice. Tax jurisdiction is set on the delivery-site record, so a tanker that ran across more than one county bills the right rate per location. Invoices post to QuickBooks Online on close.

Maintenance on tank trailers.

A tank trailer carries a pump, a power take-off, or running gear that all wear, so its service clock runs on the in-service hour meter rather than the calendar, captured when the return inspection records it. The maintenance module advances the preventive-maintenance interval from that reading, so a tanker running daily lease hauls comes due on real use while a yard spare does not get serviced for hours it never ran. The work that matters is specific to a road tanker: repacking and adjusting the trailer brakes and bearings, checking tires and the suspension after highway miles, servicing the transfer pump and its drive, exercising the relief and vapor valves so they seat, reseating manhole and dome gaskets, and chasing weeps at fittings, hoses, and the dome ring. Interior lining and coating condition rides alongside, since product attacks it from the inside. Work orders, parts, lining history, and inspection findings live on the unit record, where a damage or wash-out charge from a return becomes a repair ticket.

Tank Trailer return inspections.

Two inspection rhythms apply. The periodic external visual inspection is a federal requirement for a DOT cargo tank and is logged against the unit on its own interval; the spec table shows that cadence. The yard's day-to-day control is the return inspection run before the trailer comes off rent. The driver works a mobile-web checklist on a phone — no app install — records the in-service hour reading, and attaches required photos that cannot be skipped, because with a tanker the dispute is usually about what is left inside. The inspector confirms the wash-out and notes the last-contained product, checks for a heel or residue in the bottom, looks the interior lining over for gouges, peeling, or chemical attack, exercises the relief and vapor valves and the dome and discharge gaskets, and documents dents, weeps, and trailer damage. Tying that record to the rental before the truck leaves is what makes a cleaning or damage charge hold up.

Common tank trailer classes in the field.

The product, the same way it runs for tank trailers.

The sections below are the EquipFlow modules that matter most when running tank trailers — each links to the full feature detail.

Operator guides for running tank trailers.

Field-tested playbooks that go deeper on pricing, dispatch, billing, and maintenance for fleets like this.

• Dewatering Pump Rental Guide →
• Equipment Rental for Oilfield Operations →
• How to Bill for Equipment on Standby →
• Managing Recurring Rental Customers →

What you give up running tank trailers in EquipFlow.

EquipFlow is a web app, so the return inspection needs a signal to load. On a remote lease or a yard dead spot, the driver cannot finish the mobile inspection on site; most yards run it when the trailer comes back, which means the wash-out and lining photos land later than ideal. There is no automated level, pressure, or location telemetry today, so how full a tank is on the road is not pulled in — that stays a field note at load and at drop. And there is no built-in hazmat manifest or placarding workflow; the system tracks the rental and the last-contained product, not the shipping paper. A yard with an unusual billing structure or a heavy compliance need should bring it to the demo to be scoped honestly.