RJ 15 Rolling Jacks for Municipal Fleets: Symmetric vs Asymmetric Arms

If you run a municipal fleet shop in the Iowa Great Lakes region, the RJ 15 rolling jack is probably already on your shop floor, or it should be. Between plow trucks, transit buses, and squad cars, your techs are constantly ducking under vehicles to service exhaust systems and driveline components, and doing that safely means having the right combination of a two post lift and a rolling jack that can actually reach the lift points you need. We install and service lifts across Iowa, and one question we get from fleet managers over and over is whether their bays are set up correctly to use an RJ 15 the way it was designed to be used, especially when it comes to picking symmetric versus asymmetric arms on the lift itself.

Why Fleet Shops Reach for the RJ 15

Fleet maintenance work is heavier and more repetitive than typical repair shop work. A tech doing exhaust replacements or driveline service on ten trucks a day cannot afford a rolling jack that struggles under load or needs constant repositioning. The RJ 15 gives fleet shops the lift capacity and low profile needed to slide under a raised vehicle and get a stable pick point on a differential, transmission crossmember, or exhaust hanger without fighting the equipment. Its footprint matters too, because narrow rolling jacks navigate more easily around dual rear axles and plow mounts than bulkier alternatives.

We have placed rolling jacks in fleet bays from small township garages up through larger county and city shops, and the consistent theme is that the jack needs to complement whatever two post or four post lift is already anchored in the bay. A rolling jack is only as useful as the clearance it has to roll into position, and that clearance is dictated directly by the lift’s arm configuration. That is where the symmetric versus asymmetric decision becomes a safety issue, not just a convenience one, especially for exhaust and driveline tasks where technicians need to work from multiple angles under a raised vehicle.

Symmetric Arms: When They Make Sense for Fleet Bays

Symmetric two post lifts center the vehicle evenly between the columns, which is the traditional layout many older municipal shops still run. For fleets that service a narrow, consistent range of vehicles, like a city public works department running mostly one or two truck models, symmetric arms can be perfectly adequate. The predictable, centered stance makes it easier to train new techs quickly since every vehicle sits in roughly the same spot every time.

The tradeoff is door and cab clearance. Symmetric lifts position the columns closer to the front and rear of the vehicle, which can crowd the door swing and make it harder to roll an RJ 15 into position at the front axle or rear differential without bumping a column. For fleets that only do underbody work occasionally, this is a manageable inconvenience. But for shops doing high volume driveline and exhaust service every day, that repeated maneuvering around columns adds real time to every job and increases the odds of a rushed, less safe jack placement.

Asymmetric Arms: The Fleet Standard for Driveline Access

Most fleet shops we work with in the Iowa Great Lakes area eventually move to asymmetric arm lifts specifically because of how much easier they make rolling jack access. Asymmetric configurations shift the columns rearward and angle the arms so the front of the vehicle swings clear of the columns, opening up a much wider, unobstructed path for the RJ 15 to roll straight in under the front axle, transmission, or exhaust system. For techs doing driveline pulls or full exhaust replacements repeatedly, that open approach path is the difference between a smooth job and a frustrating one.

Asymmetric arms also improve door clearance, which matters when techs are getting in and out of cabs repeatedly to move a vehicle into position or check clearance while raising it. For a fleet running a mix of vehicle types, from light pickups to service vans, asymmetric arms flex to accommodate different wheelbases better than a fixed symmetric setup. If your shop is still running older symmetric equipment and struggling with rolling jack access, an arm or lift upgrade is often a smaller investment than the labor hours lost to awkward jack positioning every week.

Load Ratings: Matching the RJ 15 to Your Fleet Mix

Capacity mismatches are one of the most common safety issues we see in fleet shops. A rolling jack rated appropriately for sedans and light trucks can be dangerously undersized for a loaded plow truck or a transit bus axle. Before relying on an RJ 15 across your whole fleet, confirm the specific load you are lifting at each pick point, not just the gross vehicle weight. Differential housings, subframes, and exhaust crossmembers all have different real-world lifting demands, and pushing a rolling jack near its rated limit repeatedly shortens its service life and increases tip risk.

We recommend fleet managers keep a simple capacity chart posted near each bay listing the heaviest vehicle serviced there and the corresponding jack rating required. It sounds basic, but in fleet environments with rotating staff and seasonal hires, that visual reminder prevents a lot of near misses. If your fleet mix includes anything approaching the top of an RJ 15’s rated capacity on a regular basis, it is worth talking with us about stepping up to a higher-capacity rolling jack rather than running near the edge of the rating every day.

Safety Protocols Specific to Exhaust and Driveline Work

Exhaust systems present a unique hazard because they are frequently hot, rusted, and unpredictable in how they release once a bolt or hanger fails. When positioning an RJ 15 under an exhaust system, our techs always confirm the vehicle is fully settled on the lift’s mechanical locks before rolling the jack into place, never relying on hydraulic pressure alone to hold the vehicle steady while a jack is being repositioned underneath. Driveline work carries similar risk because a dropped transmission or differential can shift unexpectedly the moment the last mounting bolt comes free.

We train fleet techs to always support the component fully on the rolling jack’s saddle, centered and secured, before removing final fasteners, and to keep hands clear of pinch points as the jack is raised or lowered. Wet or icy floors are an added winter hazard specific to the Iowa Great Lakes region, where fleet bays see constant truck and plow traffic tracking in snow and salt. Keeping the rolling jack’s wheels clean and the bay floor dry around the lift reduces slip risk significantly, and it is a simple habit that costs nothing but pays off every winter.

Maintenance That Keeps Fleet Rolling Jacks Reliable

Fleet duty cycles are hard on equipment, and an RJ 15 that gets used a dozen times a day needs more frequent attention than one in a low-volume shop. We recommend fleet maintenance teams check hydraulic fluid levels weekly, inspect the saddle and lifting arm for cracks or bent components monthly, and grease the wheel casters and pivot points on a regular schedule to keep the jack rolling smoothly under load. A jack that sticks or rolls unevenly is harder to position precisely, which directly undermines the safety benefit of choosing the right arm configuration in the first place.

We also encourage fleets to standardize on genuine replacement seals and parts rather than generic substitutes, since a jack that loses pressure slowly under a raised driveline component is a serious hazard. If you are not sure whether your current rolling jack fleet is due for service, we can walk through your maintenance logs with you and flag anything that is overdue. A five-minute weekly check is far cheaper than an unplanned failure mid-job.

Planning Your Bay Layout Around the RJ 15

The final piece fleet managers often overlook is simply whether the bay itself is laid out to support efficient rolling jack use. Storage location matters: if the the lift lives on the far side of the shop from where it is needed most, techs will be tempted to skip using it correctly or rush the approach. We suggest storing rolling jacks near the lifts where driveline and exhaust work happens most often, with a clear, unobstructed path between storage and the lift bay.

Floor space around the lift columns also needs enough clearance for the jack’s full turning radius, particularly with asymmetric arm lifts where the approach angle is wider. When we do fleet consultations across the Iowa Great Lakes region, bay layout is often the single biggest factor separating a shop that gets full value from its rolling jacks and one that fights its own equipment daily. A short conversation about column placement, jack storage, and traffic flow before you buy new lifts can save years of workarounds.