Weighing at a CAT Scale: How It Works, What It Costs, and the Reweigh Trick

Your first time at a certified scale shouldn't be a mystery ritual performed while four trucks idle behind you. Here's the whole procedure, the numbers you're aiming for, and why the reweigh is the best few bucks in trucking.

The numbers you're aiming for

Standard federal limits for a typical 5-axle combo on interstates:

• Steer axle: 12,000 lbs (tire-rating dependent)
• Drive tandems: 34,000 lbs
• Trailer tandems: 34,000 lbs
• Gross: 80,000 lbs

The trap most new drivers fall into: legal gross does not mean legal axles. You can scale 76,000 total and still be 2,000 over on the drives because the load sits wrong. Axle weights are what the DOT writes tickets about — and what the reweigh exists to fix.

The procedure, minus the stage fright

1. Find the platforms. A certified scale has three in a row. Pull forward until steers sit on the first, drives on the second, trailer tandems on the third. Not sure you're placed right? The intercom exists; scale operators would rather guide you than weigh you wrong.
2. Hit the intercom or use the app. Give your truck/trailer numbers (or skip the window entirely — the Weigh My Truck app pays and delivers the ticket to your phone without leaving the seat).
3. Wait for the go-ahead, pull off, get your ticket inside at the fuel desk if you didn't use the app.
4. Read it per-axle, not just the gross. That's the whole point of paying.

What it costs — and the reweigh trick

A first weigh runs around $13–15; a reweigh within 24 hours is a few bucks (order of $4). That cheap reweigh is the mechanism that makes everything work: weigh, discover the drives are heavy, slide the trailer tandems (each hole moves roughly 250–400 lbs between axle groups, trailer-dependent), reweigh to confirm, done. Two weighs and a slide beats one roadside ticket by a couple hundred dollars and a CSA points hangover.

CAT's guarantee is the quiet reason drivers are loyal: weigh legal on their ticket and still get an overweight fine at a state scale, and they'll back you — pay the fine or defend it. That guarantee is why "get a scale ticket" is standard practice after any suspicious load, not paranoia.

When to weigh

• After loading, before the highway — every time the load is heavy, dense, unevenly stacked, or loaded by someone who wouldn't be paying your ticket.
• Before a state scale you can't avoid if you have any doubt at all.
• Reefer loads and paper-heavy freight (produce, liquids, anything palletized dense) deserve extra suspicion — shipper BOL weights are optimistic fiction often enough to matter.

Weigh stations are the exam this scale is the study session for — the weigh station guide covers who has to stop and what happens inside. And Roadmark's map shows CAT scales along your route so the answer to "where's the nearest one" is a glance.

Quick answers

How much does a CAT scale weigh cost?

Usually in the $13–$16 range for a first weigh, with reweighs the same day costing only a few dollars. Prices creep up over time, so check the app or the booth.

Is a CAT scale weight guaranteed?

Yes — CAT's guarantee program stands behind their number. If you get an overweight ticket after a compliant CAT weigh, they have a process to back you up.

How do I position my axles on the scale?

Steer axle on the first platform, drives on the second, trailer tandems on the third. Pull forward slowly until each group is centered, set the brakes, and stay in the truck unless the intercom says otherwise.