Use case · Trailer rentals

One rental, end to end

Taking a booking is the easy part. This is the other four days: who loads the trailer, which physical unit went out, what came back, what it now needs, who gets paid for the work, and whether the deposit is returned or kept. One 6×10 enclosed cargo trailer, followed the whole way.

ORDER
#28603
ASSET
ENC610-01
HIRE
Three days, delivered
DEPOSIT
$200, held not taken

Sarah Miller books a 6×10 enclosed cargo trailer for a three day job in Austin and asks for it to be delivered. She never picks a particular trailer — she books the product. Somewhere behind that listing sit three real units, and by Friday morning one of them has her name on it.

Every screen below is the running system doing the work, in the order a yard would actually touch it.

PART 01

The customer books

Dates, a price, a deposit and a signature — settled before anybody in the yard has done anything.

The calendar already knows what is free

Red days are days this trailer cannot be had. That comes from live reservations across all three units, so it moves on its own when a booking lands, when a unit goes out of service, or when the workshop is holding one.

Two month availability calendar for the trailer with unavailable days in red and available days in green
Real availability, not a blocklist. Early September is committed. From the 11th the fleet is free again, which is why those are the dates she gets.

The length of the hire sets the price

Four hours, a day, three days, a week, a month. She picks dates and the right band applies. A GPS tracker goes on the hire as well.

Booking form showing a GPS tracker selected and a final total of 270 dollars for three days
$270 for three days. $255 for the band, $15 for the tracker. Availability still reads 3, because nothing is held until an order is paid for.

Delivery is a choice at checkout, and the deposit is stated

She takes delivery to an Austin address rather than collecting. The refundable deposit appears as its own line, separate from the amount actually being charged, so there is no argument about it later.

Checkout page with delivery selected at 75 dollars, a total of 369.15 and a separate 200 dollar security deposit line
$369.15 to pay, $200 to hold. Two different numbers, shown as two different things.

Paid, and the deposit is already held

Nobody in the office pressed anything. The payment landed, the order moved to processing, and the $200 was authorised against the card on file — a hold, not a charge.

Admin order screen for order 28603 showing status processing and a security deposit accepted badge against a Visa card
Security Deposit Accepted. The box that would capture some of it sits there unused. Most rentals never touch it; the day something comes back broken, the card is already on file.
PART 02

What the yard sees on Friday morning

Staff do not open a list of orders. They open the day.

Four questions, answered before anyone clicks

What is out right now, what needs a person, what moves today, and how the next seven days look. The run sheet has a line at the current hour, so the next job is the one under the line.

Operations dashboard with a live band of items out and next movements, an attention row, today's run sheet and a seven-day grid
The attention row ranks by urgency and gives each line the one action that clears it. A yard running clean sees Nothing needs you instead.

The month, without anyone maintaining it

One booking is not interesting on its own. What matters is what it does to the picture the yard runs on — and that picture is the same reservations read a different way, not a spreadsheet somebody keeps up to date.

Booking schedule stock view showing a month grid of products against days, each cell counting units free and units out
Every product, every day. The enclosed cargo trailer row runs three, three, three until the day this hire starts, when it drops to two. Nobody types those numbers, and they move again if a booking is cancelled or a unit goes on the bench.
PART 03

Out of the yard

This is where an abstract booking becomes a specific object with a serial number on it.

It surfaces on the day it is due out

The dispatch list for the 11th has the new order at the top: nothing overdue, the delivery address attached, and a direct route into the job itself. The rest of the list is other work, ranked by how late it is.

Logistics due to send list with order 28603 at the top showing zero days overdue and its delivery address
Due to Send. A driver loading the van reads this top to bottom. What happens once the van leaves is its own use case: The run, in the van.

One screen for the person standing next to the trailer

Customer and phone number, the dates, what has been paid, what still needs signing, the state of the deposit, the invoice, and the item to pick. No walking back to the office to check any of it. That screen is the staff app; the same phone carries every email, SMS and WhatsApp exchange with this customer on one thread, which is a use case of its own.

Prepare order screen showing paid in full, one document to sign and the trailer line marked not collected
Paid in full. One document to sign. Those two badges are the whole status of the job.

A specific trailer leaves, and it is attributed

Staff choose which of the three units physically goes, from the ones genuinely free for these dates. The order line then records the unit, the person who picked it and the time — so “which trailer did she have” is a fact rather than a memory.

Order line marked collected, showing which serial unit was picked and by whom
Collected, with a name on it. Availability for the product does not spring back up: the unit is out until it is taken back.

The paperwork changes with the job

The order is now Sent, and the form on the screen has changed with it. The rental contract is gone and the handover checklist has taken its place, because that is the form that belongs to this moment. Whoever is holding the trailer is never presented with the wrong one.

Paid → rental contract Sent → handover checklist Returned → return inspection
Job screen with status Sent, the trailer handover checklist waiting to be signed, and the unit card carrying a meter strip
Trailer Handover Checklist, on cue. The card is now the unit — ENC610-01, not the generic product — and it has grown a usage strip already carrying the three rental days this hire is worth.
PART 04

Back in the yard

The same screen, turned around. This is where the yard finds out what state its fleet is in.

The reading is taken with the trailer, not afterwards

The desk does not do arithmetic and does not run a second errand. The usage reading is already suggested from the length of the hire, and accepting it is part of taking the trailer back. One action, two facts recorded.

Job screen with status Returned, the return inspection checklist to sign and a recorded reading of three rental days
Returned, and the return inspection appears. The reading of 3 is now history rather than a suggestion, and the next one is projected at 6.

Three rental days is an inspection

This yard inspects an enclosed trailer every three rental days and safety-checks it once a year. The unit that just came back has done exactly three, so it changes its own status at the counter — no overnight job, no one remembering to look.

Fleet panel showing unit one overdue with its last reading while units two and three remain OK
Unit 1 is Overdue. Units 2 and 3 are not. They did not go out, so they did not wear. Each trailer keeps its own clock.

Why this is the part that matters. A booking system that stops at the order can tell you a trailer was hired. It cannot tell you which one, how hard it has been worked, or that it is now due a check before it goes out again. Here the hire, the unit, the wear and the workshop are the same record, so the yard finds out at the counter rather than on the hard shoulder.

PART 05

The work it asked for

The trailer flagged an inspection. Somebody has to do it, and it has to cost something.

An hour and a half, two lamp units, and a rate nobody typed

The job is raised straight off the due list, so it already knows which trailer it is for and which rule sent it. The mechanic’s labour prices itself from his own hourly rate. While the job is open the trailer cannot be sold, and closing it puts the trailer back in the fleet and sets the next inspection three rental days out.

Saved work order showing the labour line with an hourly rate of 38 dollars filled in automatically
$38 an hour, never typed. 1.5 hours of labour at $38 is $57, two lamp units at $6.50 are $13, and the job costs the yard $70.
PART 06

Settle the money

Three separate questions: what is owed to staff, what this asset earned, and whether the customer gets their deposit back.

Wages arrive without a timesheet

The payout ledger derives from work that already happened, so the inspection labour is there the moment the job is saved. Every line points back at the job that produced it, and recording the payment freezes it — a line cannot be paid twice, and a mistake is reversed by voiding the batch rather than deleting it.

Employee payouts screen showing 57 dollars unpaid across a single line
$57.00 unpaid. The labour, and only the labour. The $13 of parts is a cost to the business, not wages.

Did this trailer pay for itself

The profit report measures each asset against what the yard actually spent on it. The purchase prices of all three units roll up to the product, and this morning’s workshop bill lands against the same line. A manager sees a fleet, not three fragments.

Profit report row for the enclosed cargo trailer showing 10,200 dollars invested and 70 dollars of maintenance cost
$10,200 invested, $70.00 of maintenance. Booked, collected and invested sit side by side, so recovery on the asset is a number rather than a feeling.

The deposit goes back

The trailer came back needing routine maintenance, not repair. So the hold is released rather than captured and she is charged nothing beyond the hire. Had there been damage, the same panel takes any part of the $200 against the card that has been on file since the day she paid.

Completed order showing the security deposit canceled, a total of 369.15 and the 200 dollar deposit line
Security Deposit Canceled. $369.15 taken, $200 released, order closed.
Money in this runWhere it went
$369.15Charged to the customer — three day hire, tracker, delivery
$200.00Held on her card at payment, released at completion
$57.00Owed to the mechanic, on his payout the moment the job was saved
$13.00Parts, a cost to the business
$70.00Total workshop cost, recorded against a fleet that cost $10,200

The whole run in eight lines

What this proves

Captured live on the Trailer Rentals demo. Order 28603, unit ENC610-01. Screenshots are of the running system, unretouched.

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