Abstract: A tandem axle suspension system includes a first leaf spring having a first eye end and a second eye end, a second leaf spring having a third eye end and a fourth eye end and an assembly for converting double eye leaf springs of a tandem axle suspension system into slipper springs. That assembly includes a keeper including a first guide track and a second guide track, a first follower adapted for receipt of the first eye end and sliding movement along the first guide track and a second follower adapted for receipt of the third eye end and sliding movement along the second guide track.

Abstract: An adjustable spring mounting assembly includes an adjustment plate, including a receiver, an elongated axle alignment slot and at least one height adjustment aperture, and an alignment correction insert received and held in said receiver. The alignment correction insert includes a plurality of alignment correction apertures wherein a selected one of the plurality of alignment apertures is aligned with the elongated axle alignment slot to correct axle alignment of the vehicle.

Abstract: A tandem axle assembly includes a first slipper spring and a second slipper spring. The two slipper springs are configured or oriented in series with the slipper ends of the two slipper springs oriented toward each other. A keeper for a tandem axle suspension assembly is also disclosed.

Abstract: A tandem axle assembly includes a first slipper spring and a second slipper spring. The two slipper springs are configured or oriented in series with the slipper ends of the two slipper springs oriented toward each other. A keeper for a tandem axle suspension assembly is also disclosed.

Abstract: An adjustable spring mounting assembly includes an adjustment plate, including a receiver, an elongated axle alignment slot and at least one height adjustment aperture, and an alignment correction insert received and held in said receiver. The alignment correction insert includes a plurality of alignment correction apertures wherein a selected one of the plurality of alignment apertures is aligned with the elongated axle alignment slot to correct axle alignment of the vehicle.

Abstract: An axle alignment system for a multi-axle trailer includes a mounting bracket, a mounting pin, at least one original equipment spacer, and at least one adjustable spacer. When the mounting bracket is utilized with the mounting pin and the original equipment spacer, the axle alignment system will only exclusively assume a nonadjustable, standard configuration. In contrast, when the mounting bracket is utilized with the mounting pin and the adjustable spacer, the axle alignment system will be activated and assume one of multiple possible adjusted configurations allowing one to align an axle of a multi-axle trailer.

Abstract: A shock absorber mounting assembly is provided for a trailer incorporating a leaf spring suspension. That mounting assembly includes a first shock absorber mounting bracket secured to a frame of the trailer and a second shock absorber mounting bracket secured to an axle of the trailer. The second shock absorber mounting bracket includes of tie plate, an elongated shock absorber mounting lug extending from the tie plate and an adjustable suspension alignment feature.

Abstract: An axle alignment system for a multi-axle trailer includes a mounting bracket, a mounting pin, at least one original equipment spacer, and at least one adjustable spacer. When the mounting bracket is utilized with the mounting pin and the original equipment spacer, the axle alignment system will only exclusively assume a nonadjustable, standard configuration. In contrast, when the mounting bracket is utilized with the mounting pin and the adjustable spacer, the axle alignment system will be activated and assume one of multiple possible adjusted configurations allowing one to align an axle of a multi-axle trailer.

Abstract: A kit is provided for extending a stock support leg of a trailer jack and thereby allowing an increased range of height adjustment of the trailer jack end of the trailer. That kit includes a spacer that is received over a portion of the stock support leg of the trailer and an extension support leg that is received over the spacer.

Abstract: A shock absorber mounting assembly is provided for a trailer incorporating a leaf spring suspension. That mounting assembly includes a first shock absorber mounting bracket secured to a frame of the trailer and a second shock absorber mounting bracket secured to an axle of the trailer. The second shock absorber mounting bracket includes of tie plate, an elongated shock absorber mounting lug extending from the tie plate and an adjustable suspension alignment feature.

Abstract: An adjustable spring mounting assembly includes first and second alignment correction plates. A spacer is sandwiched between the two correction plates. First and second fasteners connect the assembly to a vehicle spring hanger bracket. A third fastener connects the assembly to a vehicle leaf spring.

Abstract: An adjustable spring mounting assembly includes first and second alignment correction plates. A spacer is sandwiched between the two correction plates. First and second fasteners connect the assembly to a vehicle spring hanger bracket. A third fastener connects the assembly to a vehicle leaf spring.

Abstract: An adjustable spring mounting assembly includes first and second alignment correction plates. A spacer is sandwiched between the two correction plates. First and second fasteners connect the assembly to a vehicle spring hanger bracket. A third fastener connects the assembly to a vehicle leaf spring.

Abstract: An adjustable spring mounting assembly having a first lug with a first elongated opening with a first channel and a second lug with a second elongated opening and a second channel. A mounting pin extends through the first and second elongated openings. First and second spacers received in the first and second channels hold the mounting pin in one of at least two mounting positions.

Abstract: An adjustable spring mounting assembly includes first and second alignment correction plates. A spacer is sandwiched between the two correction plates. First and second fasteners connect the assembly to a vehicle spring hanger bracket. A third fastener connects the assembly to a vehicle leaf spring.

Abstract: A pin box assembly is provided for a trailer. The pin box assembly includes a first section having a trailer attachment point, a second section carrying a king pin and a pivot connecting the first and second sections together. In addition the pin box assembly includes a shock absorber having a first end connected to the first section and a second end connected to the second sections. Still further, the pin box assembly includes an air spring connected between the first and second sections.

Abstract: An extension coupling for interconnecting a trailer to a tow hitch carried on a tow vehicle includes an elongated arm having a first end and a second end. The first end is pivotally connected to the trailer. A king pin is connected to the second end. The king pin includes a projecting stop that engages the tow hitch to strictly limit pivoting movement of the elongated arm relative to the tow hitch. In one possible embodiment, the elongated arm is a pin box assembly.

Abstract: An adjustable spring mounting assembly having a first lug with a first elongated opening with a first channel and a second lug with a second elongated opening and a second channel. A mounting pin extends through the first and second elongated openings. First and second spacers received in the first and second channels hold the mounting pin in one of at least two mounting positions.

Abstract: An extension coupling for interconnecting a trailer to a tow hitch carried on a tow vehicle includes a pin box assembly having a first end and a second end. The first end is pivotally connected to the trailer. A king pin is connected to the second end. The pin box assembly includes a locking wedge that engages the tow hitch to strictly limit pivoting movement of the pin box assembly relative to the tow hitch.

Abstract: A pin box assembly is provided for a trailer. The pin box assembly includes a first section having a trailer attachment point, a second section carrying a king pin and a pivot connecting the first and second sections together. In addition the pin box assembly includes a shock absorber having a first end connected to the first section and a second end connected to the second sections. Still further, the pin box assembly includes an air spring connected between the first and second sections.