The 2021 Keystone Carbon 348 is a premium, dual-axle fifth-wheel toy hauler engineered for outdoor enthusiasts who refuse to leave comfort behind. Perfectly balancing rugged utility with upscale residential living, this model is built for off-grid durability, extensive gear transport, and spacious multi-passenger camping.

Rugged Toy Hauler Performance & Outer Construction

• Spacious 13-Foot Cargo Garage: Equipped with industry-leading, frame-welded 5,000 lb. capacity tie-downs and durable Dyna Span floor decking to securely haul ATVs, motorcycles, or side-by-sides.
• Weather-Ready Endurance: Built with an enclosed and heated underbelly for extreme temperature protection, alongside a highly durable AlphaFlex TPO roof.
• Off-Grid Capabilities: Comes equipped with the SolarFlex 200 solar energy system and a 5,500-watt Onan generator powered by a 30-gallon fuel station.
• Outdoor Living: Features a rear ramp door that transitions into a back patio with an awning, dual entry/exit doors, and an outdoor entertainment center setup built directly into a slide-out tray.

Premium Interior & Residential Comforts

• Gourmet Kitchen Island: Designed with extra countertop space, a large farmhouse-style stainless steel sink with a high-rise faucet, a 12 cu. ft. refrigerator, and a 3-burner cooktop with a 22-inch oven.
• Luxury Living Space: Relax in residential reclining theater furniture equipped with heat, light, and massage functions while watching the entertainment center's 50" LED TV with integrated surround sound.
• Climate Control & Utilities: Kept cool by high-efficiency Omni-Chill A/C units and supplied with endless hot water via an on-demand tankless water heater.
• Private Master Suite: Up front, enjoy a private bedroom boasting a queen bed, wireless phone chargers, abundant wardrobe storage, and a separate overhead loft space perfect for extra guests or storage.

Key Specifications

Specification

Metric / Measurement

Length

38 ft 11 in to 40 ft 4 in (depending on trim additions)

Dry Weight

12,691 lbs

Carrying Capacity

4,309 lbs

Hitch Weight

3,130 lbs

Slide-outs

3

Sleeping Capacity

Up to 7 or 8 people

Tank Capacities

Fresh: 94 gal | Gray: 82 gal | Black: 44 gal

The 2021 Keystone Carbon 348 is a premium, dual-axle fifth-wheel toy hauler engineered for outdoor enthusiasts who refuse to leave comfort behind. Perfectly balancing rugged utility with upscale residential living, this model is built for off-grid durability, extensive gear transport, and spacious multi-passenger camping.

Rugged Toy Hauler Performance & Outer Construction

• Spacious 13-Foot Cargo Garage: Equipped with industry-leading, frame-welded 5,000 lb. capacity tie-downs and durable Dyna Span floor decking to securely haul ATVs, motorcycles, or side-by-sides.
• Weather-Ready Endurance: Built with an enclosed and heated underbelly for extreme temperature protection, alongside a highly durable AlphaFlex TPO roof.
• Off-Grid Capabilities: Comes equipped with the SolarFlex 200 solar energy system and a 5,500-watt Onan generator powered by a 30-gallon fuel station.
• Outdoor Living: Features a rear ramp door that transitions into a back patio with an awning, dual entry/exit doors, and an outdoor entertainment center setup built directly into a slide-out tray.

Premium Interior & Residential Comforts

• Gourmet Kitchen Island: Designed with extra countertop space, a large farmhouse-style stainless steel sink with a high-rise faucet, a 12 cu. ft. refrigerator, and a 3-burner cooktop with a 22-inch oven.
• Luxury Living Space: Relax in residential reclining theater furniture equipped with heat, light, and massage functions while watching the entertainment center's 50" LED TV with integrated surround sound.
• Climate Control & Utilities: Kept cool by high-efficiency Omni-Chill A/C units and supplied with endless hot water via an on-demand tankless water heater.
• Private Master Suite: Up front, enjoy a private bedroom boasting a queen bed, wireless phone chargers, abundant wardrobe storage, and a separate overhead loft space perfect for extra guests or storage.

Key Specifications

Specification

Metric / Measurement

Length

38 ft 11 in to 40 ft 4 in (depending on trim additions)

Dry Weight

12,691 lbs

Carrying Capacity

4,309 lbs

Hitch Weight

3,130 lbs

Slide-outs

3

Sleeping Capacity

Up to 7 or 8 people

Tank Capacities

Fresh: 94 gal | Gray: 82 gal | Black: 44 gal