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A trailer is only as strong as the weakest part of its running gear. Axles, springs, hangers, tires and wheels each carry a rating, and the trailer's safe capacity is limited by the lowest one. When you replace springs, matching that rating matters as much as matching the size. Spring rating vs axle rating Trailer leaf springs are usually rated per spring, while axles are rated per axle. A 3,500 lb axle, for example, normally uses a pair of springs rated to support that load between them. Fitting heavier springs than the axle is rated for does not raise the...

Trailer Suspension Maintenance Before Towing SeasonInspect before loadingWith the trailer safely parked, check for broken or shifted leaves, unusual side-to-side height differences and visible contact marks. A lean may have causes beyond the springs, so inspect rather than guessing. Never crawl beneath a trailer supported only by a jack.Look at the moving joints and mounting pointsOn applicable leaf-spring systems, inspect spring eyes, bushings, shackles, hangers and equalizers for obvious wear, cracking or distortion. Check for loose or displaced hardware. Lubricate only components designed for it, using the manufacturer's lubricant and interval; not every bushing needs grease.Check axle clamping and tire...

U-Bolt Sizing Guide for Leaf Spring SuspensionsMatch the shape to the axle and seatU-bolts can be round, square or semi-round. Their bend must suit the axle and spring-seat arrangement. A visually similar bend is not proof of correct fit, and forcing an incorrect shape can affect clamping.Specify dimensions clearlyRecord rod diameter, inside width and leg length using the hardware supplier's measurement convention. Include the required thread length and the assembled spring-pack, plate, washer and nut stack. Thread pitch, material and grade matter as well as overall size. Do not select U-bolts by wrench size alone.Use new hardware and the correct...

Ordering a replacement leaf spring is easiest with the part number stamped or tagged on your old spring. If the number is gone, these six measurements let us match it, or build one to suit, for any truck, trailer or classic vehicle in Canada. Start with identification, not a tape measureFind the original spring number, axle information and the vehicle or trailer identification. Record any suspension modifications. A matching catalog number is useful evidence, but still confirm the application and mounting details.Confirm the measurement conventionDouble-eye, slipper and other springs are not measured identically. Ask the supplier whether to measure straight...

Truck squatting when you tow? A plain comparison of new lift or heavy-duty springs, add-a-leaf kits and air helper springs.