Ridewell suspensions
Ridewell’s catalogue separates truck drive, auxiliary and trailer suspensions. Prefixes and suffixes matter: RSS steerable auxiliary products serve a different role from RAR primary trailer suspensions, and truck and trailer versions may have different identifiers. Start with the identification plate and exact configuration. The product-family pages below organize those differences; installation, loading and service decisions require the correct manufacturer drawings and vehicle-specific approval.
Compare the model families
| Model / family | Application | Overview | Model notes |
|---|---|---|---|
| RAR-240 | Primary trailer air suspension | RAR-240 is a Ridewell primary trailer air-ride suspension family. Ridewell’s product and service references distinguish several arrangements, including underslung, overslung and other mounting configurations. The RAR-240 name is therefore not enough to select a replacement assembly or establish ride height. | In this guide |
| RAR-266 | Primary trailer air suspension | RAR-266 is another Ridewell primary trailer air-ride suspension family. Ridewell’s literature includes RAR-266-LDA and distinguishes mounting arrangements in its technical references. It should not be treated as an interchangeable RAR-240 simply because both are trailer air suspensions. | In this guide |
| RSS-233 | Steerable auxiliary suspension family | Ridewell lists RSS-233 as a steerable auxiliary axle suspension for trucks, with several rating variants. Its documentation separately identifies RSS-233T trailer applications. The suffix, rating and installation matter; a truck version should not be assumed to match a trailer assembly. | In this guide |
Bring the exact specification.
The family name helps organize your search. The build sheet, serial number and relevant manufacturer documentation identify what is installed. Compare like-for-like applications and request evidence for cost or performance claims.
Manufacturer references support the model facts. Our examples and comparisons are editorial interpretation prepared with AI assistance, not road tests or an expert inspection.
Check the year, market and exact build before applying a specification. This guide does not authorize parts fitment, repairs, modifications or loading.
Ridewell manufacturer reference ↗Independent editorial resource. Brand names identify equipment; they do not imply a partnership or endorsement.
RAR-240
Primary trailer air suspension
Source checkpoint:
RAR-240 is a Ridewell primary trailer air-ride suspension family. Ridewell’s product and service references distinguish several arrangements, including underslung, overslung and other mounting configurations. The RAR-240 name is therefore not enough to select a replacement assembly or establish ride height.
Scope North American model family; equipment and availability vary by model year and configuration.
RAR-240 covers several different arrangements
Ridewell’s main RAR-240 listing includes overslung, underslung and yoke-mount configurations rated at 25,000 or 30,000 lb, plus a compact low-mount version rated at 15,000 lb. A separate RAR-240 Banana Beam page specifies 25,000 lb and low mounting for disc-brake applications. The shared family number does not identify one universal layout.
Resolve the mounting description before the price
A quotation labelled only “RAR-240” is incomplete for a useful comparison. Ask which mounting arrangement and brake application the supplier has matched to the trailer’s suspension identification. Then compare what each quote includes: the suspension alone, an integrated axle or additional mounting hardware. A photo can help communicate the question, but it should accompany the identification and drawing rather than replace them. This prevents the compact or disc-brake variant from being priced as though it were the same assembly as another RAR-240 configuration.
What matters in a comparison
For an RAR-240 trailer, record the complete suspension identification, mounting arrangement and axle details. Compare a service quotation with the matching engineering drawing. A similar beam shape or family prefix is not evidence of compatibility. Ask for the trailer’s running-gear and alignment history when evaluating used equipment, and keep that evidence separate from a seller’s general ride-quality description.
Questions to take to the supplier
- Which mounting configuration and model code are installed?
- Does the quoted assembly match the engineering drawing?
- Are axle and alignment records available?
Sources & limits
RAR-266
Primary trailer air suspension
Source checkpoint:
RAR-266 is another Ridewell primary trailer air-ride suspension family. Ridewell’s literature includes RAR-266-LDA and distinguishes mounting arrangements in its technical references. It should not be treated as an interchangeable RAR-240 simply because both are trailer air suspensions.
Scope North American model family; equipment and availability vary by model year and configuration.
Identify the integrated axle and the selected options
Ridewell describes RAR-266 as an integrated suspension with a large-diameter axle and captured axle connection. Published capacities are 23,000, 25,000 and 30,000 lb. Weld-on and bolt-on mounting are offered; a lift kit and an integrated height-control-valve kit are listed as available options, not equipment guaranteed on every unit.
Separate an option list from the trailer in front of you
If a seller describes a trailer as “RAR-266 with lift,” ask for the installed suspension identification and the documentation for its lifting arrangement. A family brochure listing a lift kit does not establish that the particular trailer has one. For replacement quotations, compare the mounting method and included control equipment as well as the stated capacity. Record missing information as unknown instead of assuming it is standard. This makes a used-trailer comparison more informative and avoids turning a catalogue option into an unsupported claim about the equipment being sold.
What matters in a comparison
An RAR-266 assessment should begin with model identification, axle diameter or configuration and the installation drawing. Ask which parts and control kit are specified for that actual assembly. Compare the trailer’s intended load and operating duty with its documented ratings. Service proposals should identify what is being replaced and why, rather than treating the family number as a complete parts description.
Questions to take to the supplier
- What complete RAR-266 designation is recorded?
- Which axle and mounting arrangement are installed?
- Does the service proposal reference the matching drawing?
RSS-233
Steerable auxiliary suspension family
Source checkpoint:
Ridewell lists RSS-233 as a steerable auxiliary axle suspension for trucks, with several rating variants. Its documentation separately identifies RSS-233T trailer applications. The suffix, rating and installation matter; a truck version should not be assumed to match a trailer assembly.
Scope North American model family; equipment and availability vary by model year and configuration.
The suffix is not the whole specification
Ridewell lists the truck RSS-233-13K at 13,200 lb, despite the abbreviated “13K” name. It publishes a maximum lift of 10 in. The truck RSS-233-20K is rated at 20,000 lb with 9.5 in lift. These are two specific truck variants; do not apply their figures to the separate RSS-233T trailer family.
Compare lift clearance separately from capacity
A larger capacity number does not necessarily bring a larger published lift dimension, as these two variants illustrate. When discussing a body or chassis layout with a supplier, list the required mounting envelope and lifting clearance separately from the load requirement. Ask the supplier to match the installed variant and vehicle drawing rather than choosing by the abbreviated suffix. The catalogue’s lift figure is not a measurement of tire clearance on your particular truck. Nor does a suspension rating alone determine an approved vehicle loading or axle-use arrangement.
What matters in a comparison
For an RSS-233-equipped truck, obtain the exact model and original installation documentation. Ask how the auxiliary axle was included in the completed vehicle’s approved loading arrangement. A component’s capacity does not set the legal payload or operating rules for a route. Configuration or control changes need the correct manufacturer guidance and vehicle-level assessment, not a generic family description.
Questions to take to the supplier
- Is the unit the truck RSS-233 or trailer RSS-233T?
- Which rating and installation were approved?
- What documentation covers the complete axle-control arrangement?