Luxury and innovation come together in the 2026 Newmar Grand Star 3948. Designed for travelers seeking the power of a Super C chassis combined with the craftsmanship and comfort Newmar is known for, this impressive coach delivers exceptional performance and residential luxury for life on the road.

Built on the Freightliner S2RV chassis and powered by a 6.7L Cummins turbo diesel engine producing 360 horsepower and 800 lb ft of torque, the Grand Star 3948 offers confident towing capability, impressive durability and outstanding ride quality. Paired with the Allison 3000MH six speed transmission and a 12,000 pound hitch, this Super C is ready for cross country adventures.

Inside, three slideouts create an expansive residential living area highlighted by premium furnishings, elegant cabinetry and modern styling. The open floorplan provides plenty of room to entertain guests or simply relax after a day of travel. A 74 inch Comfort Lounge sofa, booth dinette and television on a Televator create an inviting environment for extended stays.

The beautifully appointed kitchen offers generous workspace with an expandable countertop, residential refrigerator, three burner cooktop and convection microwave with air fryer capability. Thoughtful storage solutions and premium finishes make meal preparation enjoyable wherever your travels take you.

One of the most desirable features of the 3948 floorplan is the bath and a half layout. The convenient mid coach half bath is ideal for guests, while the rear master suite features a spacious full bath, large shower and optional washer and dryer. The king bed and abundant wardrobe space provide all the comforts of home.

Large holding tanks, an 8 kW generator and premium Newmar construction make the Grand Star an excellent choice for extended travel and full time RV ownership. From weekend escapes to months on the road, this luxury Super C is built to exceed expectations.

Contact us today to learn more or schedule your personal walkthrough.

Full Spec Sheet

Chassis

Freightliner S2RV Chassis

Engine

Cummins 6.7L Turbo Diesel

Horsepower

360 HP

Torque

800 lb ft

Transmission

Allison 3000MH Six Speed Automatic

Exterior Length

39 ft 11 in

Exterior Width

8 ft 5 in

Exterior Height

13 ft

Interior Height

6 ft 11 in

Gross Vehicle Weight Rating

35,200 lb

Fuel Capacity

100 gallons

Fresh Water Capacity

150 gallons

Gray Water Capacity

100 gallons

Black Water Capacity

45 gallons

Hitch Capacity

12,000 pounds

Generator

8.0 kW Generator

Number of Slideouts

3

Sleeping Capacity

Up to 7 people

Air Conditioning

15,000 BTU Roof Air Conditioner with Automatic Climate Control

Furnace

35,000 BTU Furnace

Water Heater

Truma Comfort Plus Continuous Flow Water Heater

Kitchen Features

Residential 18 cubic foot refrigerator, three burner cooktop, expandable countertop, convection microwave with air fryer, premium cabinetry and abundant storage.

Bathroom Features

Bath and a half floorplan with rear full bathroom and spacious shower. Optional washer and dryer.

Bedroom Features

King bed, wardrobe storage, optional washer and dryer and premium Newmar finishes.

Living Area Features

74 inch Comfort Lounge sofa, booth dinette, television on Televator and open residential design.

Technology Features

Sony 10 inch dash radio with Apple CarPlay, rear view camera system, electronic stability control and integrated controls.

Key Highlights

• Freightliner S2RV Super C chassis
• 360 HP Cummins diesel engine
• Allison transmission
• Bath and a half floorplan
• King bed master suite
• Three slideouts
• 18 cubic foot residential refrigerator
• Convection microwave with air fryer
• 12,000 pound towing capacity
• 150 gallon fresh water tank
• Optional washer and dryer
• Premium Newmar craftsmanship
• Built for luxury travel and full time RV living