A curtainside is a trailer with rigid roof and rear but sliding fabric sides, allowing forklift loading from either flank while the freight travels enclosed. Common in Mexican domestic freight, where the broader family is simply called 'lonas.'
A curtainside trailer pairs a fixed roof, floor, and rear frame with tensioned fabric curtains along both sides that slide open like theater drapes. The result is side access along the entire deck for forklift loading, with the cargo riding enclosed and weather-protected once the curtains close and tension. In Mexico, curtainsides and their relatives live under the everyday label 'lonas,' and they are a familiar sight in domestic distribution: beverages, packaged goods, tires, and palletized products that load from the side at plants and depots.
The distinction from the Conestoga matters: the Conestoga is an open-deck platform whose whole cover rolls away for crane access from above; the curtainside is closer to a soft-walled van, with a fixed roof that rules out top loading.
Two operational realities define curtainside freight. First, fit: it suits freight that wants side loading and weather cover but does not need the security of hard walls, because a curtain is fabric, and both pilferage risk and load-shift containment differ from a dry van, worth weighing on high-value cross-border lanes where insurance terms may care. Second, securement: curtains are weather protection, not load restraint, so internal strapping and blocking standards need explicit confirmation with the carrier. Cross-border, curtainside capacity concentrates on the Mexican side of the network; on lanes feeding from Mexican plants with side-loading docks, asking specifically for 'lona' equipment often unlocks capacity a van-only search misses.
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