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The Trailer Source

Knowledge Center

Weight ratings, towing setup, buying, and the maintenance that keeps a trailer on the road, from our shop in Greenville.

Guides on choosing a trailer, towing it safely, and keeping it maintained, written by the Trailer Source team.

15 Guides published
05 Categories
Aug 20 Last updated, 2026

Latest guide

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From the drawing board

PolyCore siding: what sets a quality enclosed trailer apart Drawn in-house
Diagram comparing riveted, wavy bare .030 aluminum trailer siding against a smooth, seamless bonded .080 PolyCore composite panel
Why we draw these

A stock photo cannot show a wiring color code, a bearing stack, or a siding cross section. Those are the parts people call us about, so we draw them instead.

The composite siding that separates a quality enclosed trailer from a cheap one. Here is what PolyCore actually is, why it stays flat and dent-free where bare aluminum wa...

Read PolyCore siding: what sets a quality enclosed trailer apart →

The full index

Every guide we have published, newest first within each category

Sales

4 guides
Roll-off trailers and bins: how the setup works A roll-off is two purchases: the trailer, and the bin it carries. How the setup... Trailer Source Team Aug 20, 2026 3 min Rent-to-own trailers: what it really costs Rent-to-own puts a working trailer behind your truck when a bank will not. It al... Trailer Source Sales Team Aug 6, 2026 9 min Choosing the right enclosed cargo trailer size A 6x12 and a 7x16 sound close on paper and haul very differently in real life. H... Trailer Source Sales Team Jul 19, 2026 5 min PolyCore siding: what sets a quality enclosed trailer apart The composite siding that separates a quality enclosed trailer from a cheap one.... Trailer Source Team Jul 12, 2026 4 min

Service & Repair

4 guides
Trailer axles: the questions we actually get asked How to find the number on your axle, why the beam is bowed, what the warranty re... Trailer Source Service Team Aug 7, 2026 11 min Do you need trailer brakes in South Carolina? The law, and how the brakes work South Carolina says any trailer over 3,000 pounds needs brakes on all wheels, pl... Trailer Source Team Jul 18, 2026 5 min No trailer lights? Here's how we track it down Nine times out of ten a dead trailer light is a bad ground, not a bad bulb. Work... Trailer Source Team May 2, 2026 4 min How to repack your trailer wheel bearings (and when to bring it in) Repacking your bearings once a year is a cheap afternoon in the driveway that sa... Trailer Source Team Mar 18, 2026 4 min

Inspection & Troubleshooting

1 guide
How to inspect a used trailer before you hand over cash A used trailer can be a great buy or a rolling headache, and the difference is u... Trailer Source Team Apr 5, 2026 4 min

Parts & Accessories

2 guides
How to read your Lippert (LCI) axle label That row of letters and numbers on your axle tag tells you the exact brakes, bea... Trailer Source Team Jul 14, 2026 6 min Choosing the right trailer tires: load range, ST vs LT, and age The wrong tire is the fastest way to a blowout on a hot day with a full load. Ma... Trailer Source Team Jun 10, 2026 4 min

Towing & Safety

4 guides
Trailer tongue weight: the number that keeps you from swaying into the ditch A trailer that sways at highway speed is usually a loading problem, not a hitch... Trailer Source Team Jul 21, 2026 5 min What your tow vehicle can actually tow That big tow number on the window sticker is the best case, not the whole story.... Trailer Source Sales Team Jul 17, 2026 5 min How to calculate a trailer's payload capacity (and stop guessing) Payload is not a mystery. It is GVWR minus what the empty trailer weighs. Find t... Trailer Source Team Jul 16, 2026 4 min Trailer axle ratings explained: what 3,500, 5,200 and 7,000 pounds really mean A 7K axle does not mean you can haul seven thousand pounds of gravel. Here is wh... Trailer Source Team Jul 15, 2026 6 min
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