CamperHardlyKnowHer

Newmar Mountain Aire 4591

Class Abuilt 2023–24Better build tierPatient search on the used market
WHAT ONE COSTS
—price not published

The maker never published an MSRP for this floorplan. Unknown is not cheap — treat any asking price against comparable models, not against zero.

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
YEARSGVWRDRYMSRP
202354,000 lb44,200 lb—
202454,000 lb44,200 lb—
  • 2023Introduced with the Cummins X15 500 hp
  • 2024Engine rating raised to 525 hp
  • 2025Dropped
FINDING ONE

Patient search — weeks of watching, and probably some travel. Why: only 2 model years. Estimated from build volume and production span — not a count of live listings.

THE READ

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

OTHER MOUNTAIN AIRE FLOORPLANS
3823 · 54,000 lb · sleeps 53825 · 54,000 lb · sleeps 44002 · 54,000 lb · sleeps 54018 · 54,000 lb · sleeps 54118 · 54,000 lb · sleeps 54360 · 44,600 lb · sleeps 54361 · 44,600 lb · sleeps 54364 · 44,600 lb · sleeps 54369 · 44,600 lb · sleeps 54372 · 44,600 lb · sleeps 54501 · 53,000 lb · sleeps 54503 · 53,000 lb · sleeps 54513 · 54,000 lb · sleeps 54519 · 54,000 lb · sleeps 5the whole 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 and watch the whole market re-rank around them. Nothing gets hidden, everything gets explained.

Rank it against your setup →

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