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Newmar Mountain Aire 4002

Class Abuilt 2019–19Better build tierScarce on the used market
WHAT ONE COSTS
$317,800est. used (2019, 7 yr old; from 27 priced floorplans of this line)
THE SPECS
Length40.8 ft
Height (incl. A/C)13.2 ft
Width8.5 ft
Interior height6.9 ft
GVWR54,000 lb
Dry weight44,100 lb
Sleeps5
Fresh water105 gal
Grey water65 gal
Black water45 gal
Fuel150 gal

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
  • 2019Introduced
  • 2020Replaced by the 41-foot 4118
FINDING ONE

Scarce: months of watching; be ready to fly and drive it home. Why: only one model year. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

The 40-foot Mountain Aire of the ISX era - shorter chassis, same 54,000 lb rating.

OTHER MOUNTAIN AIRE FLOORPLANS
3823 · 54,000 lb · sleeps 53825 · 54,000 lb · sleeps 44018 · 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 54521 · 54,000 lb · sleeps 5the whole line →
Find one for sale

Live listings for the 4002 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 4002 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.