Walkthrough of 2026 Newmar London Aire 4540

2026 Newmar London Aire 4540: Executive Overview

The 2026 Newmar London Aire 4540 stands as a robust Class A motorhome, designed for extended travel with family. Built on a 45-foot Freightliner Custom RV chassis and Newmar’s STAR foundation, it prioritizes a stable ride and structural integrity. This unit is powered by a Cummins turbo diesel engine, delivering 605 horsepower and 1950 ft-lbs of torque, supporting a 20,000-pound towing capacity. Unique to this particular build, extra underfloor insulation was added to manage engine heat, a practical consideration for extensive driving in hot conditions.

Interior Design and Customization

This London Aire features a Summit Sable interior, combining high-gloss Sable maple trim with Summit maple accents for a distinct two-tone cabinetry effect. While custom in many aspects, the most visible design elements offer a blend of refined finishes and practical utility.

Interior Living Spaces

Rear Bunk Beds and Guest Amenities

Designed to accommodate a family, including adult children, this floor plan includes bunk beds measuring 72 by 30 inches. Each bunk offers connectivity with 110V, USB-A, and USB-C outlets, along with a dedicated television. Large screened windows enhance ventilation.

Master Bathroom and Laundry

The rear master bathroom is a private suite offering substantial storage. The shower measures 30 by 40 inches, featuring a full tile surround, two integrated shelves, and black fixtures. An Aquamizer water system helps conserve water. Tank capacities are 105 gallons fresh, 80 gallons gray, and 60 gallons black. Wall-mounted dispensers for shampoo, conditioner, and soap are included, alongside towel racks and robe hooks.

A full-length mirror is integrated into the bathroom door. Laundry facilities include a Splendide stackable washer and dryer, with a dedicated soft-close drawer for supplies. Storage within the bathroom includes a large closet with hanging space and a discreet safe, along with several solid maple, soft-close drawers in various sizes for toiletries and towels. The large medicine cabinet includes interior 110V outlets for styling tools and is well-lit by inset mirror lights.

Near the Dometic porcelain toilet, a fill and dump switch simplifies blackwater tank management, especially when combined with the Sanicon system.

Mid-Coach Kitchen and Dining

The kitchen is equipped with solid maple, full-extension, push-to-release drawers for pots and pans. A Blanco sink, presented in a dark finish, features a pull-down spray faucet. Appliances include a Whirlpool convection microwave with air fryer functionality, a Fisher Paykel dishwasher, and a Whirlpool residential refrigerator. The refrigerator offers a water dispenser, ice maker, and specialized interior shelves and drawers for convenience. A whole-house water filter is standard. Notably, this unit’s exterior refrigerator was omitted by custom order, though the bay remains pre-wired for power if desired.

The dinette area provides a large eating space for four, with an expandable magnetic table. Storage for dishes, placemats, and other dining essentials is integrated beneath the seats and in overhead cabinetry.

Front Living Area and Cockpit

The living space features a Bose soundbar and a 50-inch flat-screen television. Overhead storage compartments are lined with a durable, easy-to-clean vinyl material. All interior lighting throughout the coach is dimmable.

The driver’s cockpit includes a push-button keyless start. Dash controls manage generator functions, door locks, and the coach's visors, which are track-mounted and adjustable even while driving. An ATC panel, a new feature for 2026 Newmar models, controls the shades. Gerard awning controls are conveniently located near the entry door.

Climate control is managed by an Oasis dual-loop Chinook hydronic heat system with a dedicated fan for front circulation, complemented by overhead circulation fans. The Navigo navigation system provides RV-specific routing with integrated coach weight, length, and height parameters, alongside Apple CarPlay and Android Auto compatibility. A multi-view camera system offers hitch, backup, and overhead front views. Both captain's chairs are heated and ventilated recliners, designed to swivel for additional living space seating. The large engine displacement contributes to a powerful engine brake, enhancing downhill control.

Power and Systems

This coach operates on eight AGM batteries rather than a lithium-ion system, a configuration chosen for its simplicity and the expectation of extensive generator use. A 12.5-kilowatt generator is the primary power source for running multiple air conditioning units, particularly for trackside environments where sustained power is crucial.

The HWH full-wall slide mechanism expands the living space. With the slide in, the removable bunk ladder allows access to the rear bathroom and a dedicated coat closet, which is useful for quick stops. The total carrying capacity for this unit is 6,746 pounds.

Exterior Design and Functionality

The exterior features the Onyx Package, which includes integrated headlights (updated in 2023 for improved brightness, auto-dimming, and nighttime illumination), radar for distance-based cruise control, Mobile Eye, a rain sensor on the windshield, an overhead front camera, fog lamps, a flagpole bracket, lane tracking, and blind spot assist. Fuel capacity is 150 gallons with dual fill points. Basement storage includes power easy-glide trays that extend 60%, allowing access even when the slides are deployed.

The Bottom Line

The 2026 Newmar London Aire 4540 is distinguished by its robust Freightliner chassis and powerful Cummins engine, specifically enhanced for high-mileage, family-oriented travel. Key differentiators include its spacious bunk and master bath design with extensive storage, a customized underfloor insulation for comfort, and a pragmatic power system relying on AGM batteries and a high-capacity generator. This unit emphasizes practical, long-term functionality for those seeking a high-performance motorhome for varied travel needs.