CamperHardlyKnowHer

Newmar Mountain Aire 4118

Class Abuilt 2020– (in production)Better build tierPatient search on the used market
WHAT ONE COSTS
$905,200MSRP today

Still in production — a used 2023 would run roughly $624,600.

THE SPECS
Length41.8 ft
Height (incl. A/C)13.2 ft
Width8.5 ft
Interior height6.9 ft
GVWR54,000 lb
Dry weight42,700 lb
Sleeps5
Slide-outs3
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
  • king bed(Permanent)
  • convertible dinette(Convertible)
  • 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
2020–2354,000 lb43,000 lb$905,168
2024–2554,000 lb42,500 lb$905,168
2026–54,000 lb42,700 lb$905,168
  • 2020Introduced when grey capacity went from 65 to 80 gal and black from 45 to 60 gal
  • 2024Engine rating raised from 500 to 525 hp; wheelbase 258" to 282"+tag
  • 2027MSRP $905,168; UVW 42,700 lb
FINDING ONE

Patient search — weeks of watching, and probably some travel. Why: still in production; priced at the top of its maker’s range. Estimated from build volume and production span — not a count of live listings.

THE READ

The 41-foot bath-and-a-half Mountain Aire - the middle length, and the longest-running current plan.

OTHER MOUNTAIN AIRE FLOORPLANS
Is the 4118 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.