Newmar Mountain Aire 4591

Name: Newmar Mountain Aire 4591
Brand: Newmar

Class Abuilt 2023–24Better build tierScarce on the used market

WHAT ONE COSTS

$549,500est. used (2024, 2 yr old)

Sticker was $828,800 in 2024. Out of production since 2024, so the used market is the only way to buy one. Estimate assumes a 2024 unit.

THE SPECS

Length44.8 ft

Height (incl. A/C)13.2 ft

Width8.5 ft

Interior height6.9 ft

GVWR54,000 lb

Dry weight44,200 lb

Sleeps5

Fresh water105 gal

Grey water80 gal

Black water60 gal

Air conditioning45,000 BTU

Fuel150 gal

GeneratorCummins Onan 12.5 kW diesel

A missing row means the maker never published that figure: unknown, not zero.

WHERE PEOPLE SLEEP

1× king bed(Permanent)—
1× convertible dinette(Convertible)—
1× sofa sleeper(Convertible)—

HOW IT'S BUILT: 4/5

WallsLaminated fiberglass

FrameSteel

RoofWalk-on

UnderbellyEnclosed

Newmar (Better tier): Newmar Mountain Aire

YEAR BY YEAR: WHAT CHANGED

YEARS	GVWR	DRY	MSRP
2023	54,000 lb	44,200 lb	$828,800
2024	54,000 lb	44,200 lb	$828,800

2023Introduced with the Cummins X15 500 hp
2024Engine rating raised to 525 hp
2025Dropped

FINDING ONE

Scarce: months of watching; be ready to fly and drive it home. Why: only 2 model years; priced at the top of its maker’s range. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

Two-year 45-foot plan that bridged the 2023 and 2024 lineups.

OTHER MOUNTAIN AIRE FLOORPLANS

3823 · 54,000 lb · sleeps 5 3825 · 54,000 lb · sleeps 4 4002 · 54,000 lb · sleeps 5 4018 · 54,000 lb · sleeps 5 4118 · 54,000 lb · sleeps 5 4360 · 44,600 lb · sleeps 5 4361 · 44,600 lb · sleeps 5 4364 · 44,600 lb · sleeps 5 4369 · 44,600 lb · sleeps 5 4372 · 44,600 lb · sleeps 5 4501 · 53,000 lb · sleeps 5 4503 · 53,000 lb · sleeps 5 4513 · 54,000 lb · sleeps 5 4519 · 54,000 lb · sleeps 5 the whole line →

Find one for sale

Live listings for the 4591 on the big marketplaces. Each search opens pre-filled with this exact floorplan:

RV Trader ↗Camping World ↗FB Marketplace ↗Google ↗

Inventory varies by site and day. Slim pickings? search the whole Mountain Aire line ↗

Is the 4591 your #1, or just a spec sheet?

These are the facts. Whether it beats the other six thousand rigs for you depends on what you care about. Set your priorities as sliders, switch on your hard limits, and watch the whole market re-rank around them. Every exclusion explained, every margin shown.

See where it ranks for you →

Data compiled from manufacturer spec sheets, retrieved 2026-07.