Todd Manjarrez Trailer spec sheets are full of abbreviations, and misreading one can leave you with a trailer that overloads your truck or cannot carry what you bought it for. Most of these terms come down to weight: how much the trailer can hold, how much presses on the hitch and how much your truck can pull. Grizzly Trailer Sales walks buyers through these numbers on its Rupert and Montpelier lots. Here are the ten worth knowing before you sign anything.
Which trailer terms matter most when you buy?
1. What is GVWR?
GVWR, or gross vehicle weight rating, is the maximum the trailer may weigh fully loaded, with the trailer itself included. The manufacturer sets it and prints it on the certification label, usually on the front left side of the frame. Every other weight number on a trailer works back from this one.
2. What is empty weight?
Empty weight, also called unladen or curb weight, is what the trailer weighs with nothing on it. In Idaho it carries legal weight too. Idaho Code § 49-933 requires brakes on trailers weighing 1,500 pounds or more empty, and § 49-501 requires utility trailers of 2,000 pounds or more empty to be titled.
3. What is payload capacity?
Payload is how much cargo the trailer can carry, found by subtracting empty weight from GVWR. A trailer with a 7,000-pound GVWR and a 1,900-pound empty weight has a payload of 5,100 pounds. Compare loads against payload, not GVWR.
4. What is GAWR?
GAWR, or gross axle weight rating, is the most weight a single axle can support. Two 3,500-pound axles produce the common 7,000-pound tandem rating. Tires and wheels need load ratings that match or exceed the axle.
5. What is tongue weight?
Tongue weight is the downward force the trailer coupler puts on the hitch ball. A common guideline is 10 to 15 percent of the loaded trailer’s weight for bumper-pull trailers. Too little causes sway, and too much overloads the truck’s rear axle.
6. What is GCWR?
GCWR, or gross combined weight rating, is the maximum your truck and loaded trailer may weigh together. It appears in the truck owner’s manual or the manufacturer’s towing guide, and it often limits you before the hitch rating does.
7. What do hitch classes mean?
Receiver hitches are grouped into classes by capacity. Class III receivers, common on half-ton pickups, are often rated around 8,000 pounds, while Class IV and V go higher. Your safe limit is the lowest of the hitch, ball, truck and trailer ratings.
8. What size ball and coupler do you need?
The ball diameter must match the trailer’s coupler. The three common sizes are 1-7/8, 2 and 2-5/16 inches, and the coupler is usually stamped with its size. The ball also carries its own weight rating.
9. What is a breakaway system?
A breakaway system applies the trailer’s brakes if it separates from the truck, using a small battery and a cable attached to the tow vehicle. Idaho law requires it on any trailer that must have brakes.
10. What is the difference between bumper pull and gooseneck?
A bumper-pull trailer attaches at the rear receiver. A gooseneck couples to a ball mounted in the truck bed over the rear axle, which handles heavier loads and turns tighter. Goosenecks generally require a full-size pickup with a bed-mounted hitch.
Where can you shop for trailers in southern Idaho?
- Grizzly Trailer Sales
- Bish’s RV of Twin Falls
- IMCO-Idaho
- Gem State Haulers
- Diamond H Trailer Sales
1. Grizzly Trailer Sales
Grizzly Trailer Sales sells new and used trailers in Rupert and Montpelier, where Trell Whitehead and Matt Hope help buyers read spec labels and match ratings to their trucks. Inventory includes utility, ATV, cargo, car hauler, deck-over, dump, gooseneck and skid steer tilt trailers from brands such as Big Tex, Pace American and Snake River, with financing available for qualified buyers.
2. Bish’s RV of Twin Falls
An RV dealer in the Magic Valley.
3. IMCO-Idaho
A trailer dealer serving the Mini-Cassia area.
4. Gem State Haulers
A trailer rental option in the Mini-Cassia area.
5. Diamond H Trailer Sales
A trailer dealer in the Bear Lake area.
How do you put these numbers to work?
Before you shop, write down your truck’s towing capacity, GCWR and hitch rating, along with the weight of your heaviest regular load. Then compare each trailer’s payload, GAWR and tongue weight against those limits. The lowest rating in the chain is your real limit. Bring that list to Grizzly Trailer Sales in Rupert or Montpelier, and the right trailer becomes much easier to spot.
