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Sliding tandems means moving a trailer's rear axle assembly forward or back along its rails to shift weight between the tractor's drive axles and the trailer axles. It matters because every axle group must be legal at the scale, and a few holes of slide can be the difference between a clean ticket and a costly one.
By AltitudeCraft Gear Lab · Updated October 17, 2026
Step-by-step cheat sheet for sliding tandems the right way, from pin release to the final check.
Solo sliding without a spotter.
A per-hole chart for estimating how far a slide shifts weight between axle groups.
Work out how many holes to move before you reach the scale.
How to correct your tandem position after weighing.
Straight answers on weight rules, how the magnet works, and checking fit before you buy.
Kingpin-to-axle limits and tandem hole positions, state by state.
Magnetic and manual stoppers compared side by side.
What to do when tandems creep or won't land on the hole you want.
Practical gear picks for the driver in your life.
A carbon steel stopper with a built-in magnet and silicone pad, made for semi trailers with sliding tandems. Remove it before driving on the highway.
It means unlocking the slider pins and repositioning the trailer's rear axle assembly along the rail to a different hole, then locking it again. Moving the tandems forward or back shifts weight between the drive axles and the trailer axles.
Yes. The AltitudeCraft stopper is a positioning aid for the slide only. Remove it before driving on the highway, and do a gentle tug test after you lock the slider pins.
No. A stopper helps you land on the hole you chose, but only a scale tells you the actual axle weights. Weigh after you slide and adjust if needed.
It is designed for semi trailers with sliding tandems, such as dry vans and reefers. The locking pin is 1.5 in (38 mm) in diameter. Rail hole sizes and spacing vary by trailer maker and model year, so check your rail before you order.
Always confirm axle weights on a scale and follow your state's rules. This guide is general information, not legal advice.
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