Chevy Express Camper Van Conversion: A Practical Build Guide
Essential Answer
A Chevy Express camper van conversion starts with a used or new Chevrolet Express cargo or passenger van, typically the 1500, 2500, or 3500 series. The most practical base is a regular-wheelbase or extended-wheelbase cargo van with a high roof if available. Converting one involves removing rear interior panels, adding insulation, building a floor, installing a bed platform, running low-voltage wiring for lights and USB outlets, and adding storage. The Express has a strong body-on-frame design and a wide, boxy cargo area that simplifies flat wall and cabinet construction compared with curved modern vans.
Choosing a Base Van
Model year matters. Pre-2003 Express vans have slightly different front suspension and interior trim than 2003-and-later models. The 2500 and 3500 series offer higher payload ratings than the 1500, which is important after adding batteries, water, cabinets, and camping gear. Extended-wheelbase versions, often listed as 155-inch wheelbase, provide roughly 20 inches more interior length behind the front seats than the regular 135-inch wheelbase body. A high-roof option was not offered on most Express generations from the factory, so many owners add an aftermarket fiberglass high roof or choose a standard roof and accept reduced standing height.
Interior Dimensions and Payload
Interior width between the rear wheel wells in a standard Express cargo van is approximately 52 inches. Cargo floor length behind the front seats runs about 104 inches on a regular wheelbase and about 127 inches on an extended wheelbase. Interior height at the cargo floor is roughly 51 to 54 inches depending on roof spec. Payload capacity can range from about 1,700 pounds on a 1500 cargo van to over 3,000 pounds on a properly equipped 3500. Those numbers are manufacturer ratings and vary by axle ratio, engine, and option packages.
Stripping and Insulation
A cargo van conversion typically begins by removing any rear floor mat, plywood liner, or plastic wall panels. The metal walls and ceiling should be cleaned and checked for leaks before insulation. Closed-cell foam board and spray foam are common because they resist moisture better than fiberglass batts. Covering the ribs with thin wood furring strips creates a flat mounting surface for wall panels and prevents thermal bridging. Sound-deadening sheets on large flat panels reduce road noise before insulation goes in.
Floor and Bed Platform
A plywood floor with a durable vinyl or rubber surface is typical. The floor can be bolted through the existing cargo tie-down holes or through new holes sealed with body washers and sealant. Fixed bed platforms are usually built from 2x2 or 2x4 framing with plywood tops. A transverse bed fits across the van behind the wheel wells at roughly 52 inches wide. Taller owners or two-person setups often use a lengthwise bed, which requires a narrower mattress but leaves more standing and storage space.
Electrical System
A simple conversion uses a 12-volt auxiliary battery connected to the starting battery through a voltage-sensing relay or DC-to-DC charger. The auxiliary battery feeds LED lights, USB chargers, a roof vent fan, and possibly a small refrigerator. Wire sizes matter: a 12-gauge wire is generally fine for short LED runs, while a refrigerator or inverter may require 10-gauge or heavier cable. Fuses should be placed within 12 inches of the battery positive terminal. A 100-amp-hour lithium iron phosphate battery provides roughly 1,200 watt-hours of usable capacity at a conservative 80% depth of discharge.
Ventilation and Roof Work
Without a powered roof vent, interior moisture and cooking odors build up quickly. A 14-inch square roof vent fan is a common addition and requires cutting a matching hole in the roof. The Express roof has subtle ribs, so some owners add a wood or aluminum spacer frame to create a flat sealing surface. Use a butyl tape sealant and a self-leveling lap sealant around the fan flange. If an aftermarket high roof is installed, the cutout and sealing should be done by a shop familiar with fiberglass roof bonding.
Layout and Storage
A practical single-person layout uses a lengthwise bed on the driver side, a narrow galley counter on the passenger side, and a small aisle between them. A two-person layout often uses a rear transverse platform bed with pull-out storage underneath. Overhead cabinets can be built from lightweight plywood and mounted to the roof ribs rather than the thin sheet metal. Keep heavy items such as batteries, water tanks, and tools low and forward of the rear axle to preserve handling.
Ownership Considerations
Fuel economy on a converted Express cargo van is typically in the mid-teens per gallon depending on engine, gearing, roof height, and added weight. The 4.8-liter and 5.3-liter V8 engines are common in later 1500 and 2500 vans; the 6.0-liter V8 appears more often in 2500 and 3500 models. The 6.6-liter Duramax diesel was offered in some Express vans and provides stronger towing and low-rpm torque but adds service cost. Rust is a material concern on older Express vans, especially around rocker panels, rear wheel arches, and the base of the sliding side door. A pre-purchase inspection should include those areas plus the brake lines and fuel tank straps.
Gaps and Limits
Factory interior dimensions, payload ratings, and fuel economy figures depend on the specific year, wheelbase, roof, engine, and build configuration. This guide does not provide one universal measurement set. Crash-test data for camper-converted Express vans is not widely published, and conversion work can affect seat belt and airbag performance. Local vehicle registration, insurance, and minimum height or safety requirements for modified vans vary by region and should be confirmed before a build begins. No first-hand testing or build data is included here; the information reflects published specifications and common conversion practice.