The Chevrolet C1500 ran on the GMT400 platform from 1988 through 1999 — a completely different truck from the Square Body C10 that ended in 1987. The two platforms differ in wheelbase, cab envelope, roofline profile, shoulder-line geometry, and overall length. A cover patterned to a Square Body C10 will not seat correctly on a GMT400 C1500. DaShield builds C1500 covers to the GMT400 body geometry, with cab configuration specified at purchase.

The extended cab C1500 adds length behind the B-pillar via swing-out rear panels. This rear section changes the roofline profile in a way that a regular-cab cover cannot accommodate — the fabric runs short at the rear, leaving the cab-to-bed junction exposed. Select the cab configuration at purchase to receive the correct rear-length pattern.

For 1988-1990 OBS C1500 trucks with original single-stage lacquer finishes, the primary protection mechanism is UV block combined with vapor-breathable construction. Single-stage lacquer has no separate clear-coat buffer — once it oxidizes past the correctable point, the repair is a full respray. The woven outer blocks UV accumulation while the two-way breathable laminate allows moisture vapor to escape rather than condense against the finish.

The 1992-1998 OBS C1500 models are the most sought-after in the GMT400 collector market, with clean examples trading in the $15,000-$40,000 range. For collector-held trucks, cover selection is a preservation decision. Designed in Buena Park, California.

For the Chevrolet C1500 specifically, three fitment and protection priorities determine which DaShield product is the correct match for your truck.

Priority 1: Platform-correct body pattern. The GMT400 C1500 and the Square Body C10 are not the same truck and are not covered by the same pattern. The GMT400's aerodynamic, rounded cab produces a different shoulder-line arc, A-pillar height, and rear-quarter geometry than the Square Body's upright, squared cab. DaShield builds C1500 covers to the GMT400 body dimensions, not to an averaged shape that splits the difference between platforms. The model year range at purchase — 1988 through 1999 for GMT400 — routes the cover to the correct platform pattern.

Priority 2: Cab-configuration rear-length match. The extended cab C1500 adds length behind the B-pillar that a regular-cab cover cannot accommodate. DaShield builds extended-cab C1500 covers to the longer rear roofline specification, with the rear anchor geometry set to the extended-cab tailgate location. At purchase, the cab configuration — regular cab or extended cab — is a required specification alongside the model year.

Priority 3: Paint-era protection mechanism. 1988-1990 OBS C1500 trucks carry single-stage lacquer finishes with no separate clear-coat buffer. These finishes oxidize under sustained UV exposure without recovery — once they chalk through, the repair is refinishing. The Ultimum's multi-layer woven outer blocks UV accumulation across outdoor storage seasons. The two-way breathable laminate allows moisture vapor to escape outward, preventing the condensation-against-finish failure mode that non-breathable covers produce on temperature-cycling days. The fleece inner lining makes soft contact with single-stage and clear-coat surfaces. At $229 truck price with a Lifetime warranty, the Ultimum covers the full collector-ownership span of a GMT400 C1500 — which for a 1992-1998 OBS truck may extend decades. Care for all woven outdoor covers is wipe-down with a damp cloth; machine washing degrades the laminate barrier and is not supported.