Buying a first stock trailer: payload, floors, and whether to own one at all

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Research. We do not own a stock trailer and have not hauled an animal anywhere. What follows is the arithmetic that decides what a truck can carry, what to check on a used one, and when hiring the job out is better. When we have bought a trailer and used it a season, this page gets updated with the date.

The trailer you can afford is usually larger than the one your truck can legally carry, and the limit that stops you is payload, not tow rating.

Payload is the real ceiling

The yellow sticker in the driver's door jamb gives a payload figure. It covers everything the truck carries: people, fuel, tools, and the trailer's tongue weight.

Run it. A half-ton advertised at 11,000 lb of towing often has 1,500 to 1,700 lb of payload. A 16 ft stock trailer weighs 2,800 to 3,200 lb empty; load it to 9,000 lb and a 13 percent tongue puts about 1,170 lb on the ball. Add two adults and a toolbox and the truck is past its sticker while still "under" the tow rating that sold it.

Goosenecks are worse here, not better. Pin weight runs 20 to 25 percent, so a 12,000 lb gooseneck sets 2,400 to 3,000 lb into the bed. That is a three-quarter-ton truck's job, and that truck is part of the price.

Length is not capacity

The spec that fools first-time buyers. A 16 ft stock trailer on two 3,500 lb axles has a 7,000 lb GVWR and weighs around 2,900 lb empty. That leaves roughly 4,100 lb of animal: three mature cows, not the five or six that fit on the floor.

Floor space and axle rating are different limits, and on the cheap end the axles are the lower one. To use the length you pay for, look for 5,200 or 6,000 lb axles. Add them up, compare against the GVWR on the VIN plate, believe the smaller number.

The floor is what kills used trailers

Most stock trailers are wood planks on steel crossmembers. Urine soaks through and rots the boards from the top down while rusting the crossmembers from the top down. Neither surface is visible from underneath, which is where everyone looks. Rubber mats hold moisture against the wood for weeks if the trailer is not washed and dried.

So the inspection is: pull the mats. A seller who says no has answered the question. Then get underneath with an awl and lean on the crossmembers, especially the front third where animals stand and the rear where water drains. A tool that sinks in means the trailer needs steel and a welder, not lumber. Boards and a weekend run a few hundred to $1,500 in material; crossmembers push past $2,000 and into somebody else's shop.

Aluminum sheds 800 to 1,200 lb and does not rust, but costs 40 to 60 percent more. Used and on a budget, steel with a sound floor is the better buy.

Checking a used one

• Date codes on all five tires, spare included. Tread depth tells you nothing on a trailer.
• Jack each wheel. Spin for bearing roar, rock top to bottom for play.
• Confirm both axles have brakes. Sweep the manual lever, feel each drum for drag.
• Title and VIN. An untitled trailer is weeks at the county clerk; a lien is worse.
• Latches you can work one-handed with an animal leaning on the gate, same as a working pen.

Renting, borrowing, or paying a hauler

Owning is not the cheap option at low use. A hauler charges by the loaded mile with a minimum, and at three to six trips a year that beats a tag, insurance, tires every four to six years, bearings, and shade to park under.

The honest argument for owning is not money. It is the 6 a.m. problem: an animal that has to go to the vet today, on your schedule, in a trailer whose floor you trust. If that is real on your place, buy one. If you haul feeders to a sale twice a year, hire it.

For a small outfit that does buy: a 14 or 16 ft tandem bumper pull, brakes on both axles, 10,000 lb GVWR if the budget finds it. Bigger is a bigger truck and a wider lane.

What we are buying

The 6 a.m. problem decides this one, and it has not come up here yet. Nothing is bought, and the section above is the reason it may stay that way: at a few trips a year the hauler's bill is the cheaper answer, and that comparison is still live. A purchase puts the length, width, axle rating and floor material in here, with what we paid and the date, next to our own payload figure off the door sticker and what is left of it after us and the tools. Hiring instead puts the loaded-mile bills in the same place. Either way the count of hauls in the first year goes here, against what the other choice would have cost. The Research tag at the top does not move on a receipt. It moves when a trailer has been bought and used a season here, mats pulled and crossmembers checked. If we never buy one, it does not move at all.

Before you buy

• Read the door sticker payload before you shop trailers. That number sets the size, not the tow rating.
• Pull the mats and put an awl into the crossmembers. A soft floor separates a buy from a project.
• Turn around in your own barn lot first. A trailer that cannot maneuver at home lives hitched outside, which is how tires age out.

— Chris D., McEwen, Tennessee