Heavy loads find alignment faults faster
A truck that runs heavy, and a truck that runs loaded in one direction and empty in the other, is harder on alignment than mileage alone suggests.
Weight loads the suspension, and a loaded suspension sits differently from an unloaded one. A truck whose geometry is marginal is more or less straight empty and out of line loaded, which is the half of its life where it does the miles that matter.
That is why measuring a truck on a rack is more useful than listening to a driver. The complaint arrives, if at all, long after the steer tires started paying for it.
Unsealed access adds the second cause
Work out of this area routinely takes a tractor off pavement: aggregate pits, logging landings, construction access.
A unit working those surfaces takes impacts that do not register as events, the way a pothole on a highway does. Nothing breaks. Angles move a little, and they keep moving, and the first evidence is a steer tire worn away on a shoulder.
What gets measured
Both ends of the tractor. The drive axles determine what the front axle has to correct for, so aligning the steer alone leaves a truck pushing itself off line.
Toe, camber and caster at the steer, drive axle alignment, and the relationship between the axles. The last is what produces a truck that runs slightly crabbed down the highway, which is quiet, constant and expensive.
If the combination still tracks badly with the tractor correct, the trailer is next. Trailer alignment is offered here, and measuring both on one visit answers it properly.
The second loss
A steer scrubbed away on one shoulder is also a casing that will not pass at the plant. Lacey collects casings for retreading at the nearby Purcell plant in Portland, which makes an alignment problem a retreading problem as well.
About this store
The Lacey store runs nine services, carries all nine Purcell tire categories, and is managed by Darren Soares. Renton and Monroe also align heavy trucks.
See the national heavy-duty truck alignment page for all 40 locations.

