Newmar King Aire 4503

Name: Newmar King Aire 4503
Brand: Newmar

Class Abuilt 2015–16Better build tierScarce on the used market

WHAT ONE COSTS

$496,500est. used (2016, 10 yr old)

Sticker was $919,485 in 2015. Out of production since 2016, so the used market is the only way to buy one. Estimate assumes a 2016 unit.

THE SPECS

Length44.9 ft

Height (incl. A/C)13.3 ft

Width8.5 ft

Interior height7.0 ft

GVWR54,000 lb

Dry weight47,000 lb

Cargo capacity7,000 lb

Sleeps4

Slide-outs3

Fresh water140 gal

Grey water80 gal

Black water60 gal

Air conditioning45,000 BTU

Fuel200 gal

Engine / chassisCummins ISX15 600 hp diesel pusher · Spartan K3

GeneratorCummins Onan 12.5 kW diesel

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

WHERE PEOPLE SLEEP

1× Rear king bed(Permanent)72×80
1× Hide-a-bed sofa(Convertible)—

HOW IT'S BUILT: 4/5

WallsLaminated fiberglass

FrameSteel

RoofWalk-on

UnderbellyEnclosed

Newmar (Better tier): Newmar

YEAR BY YEAR: WHAT CHANGED

YEARS	GVWR	DRY	MSRP
2015	54,000 lb	46,400 lb	$919,485
2016	54,000 lb	47,000 lb	$919,485

2015Introduced
2016Grey tank to 80 gal, black to 60 gal
2017Discontinued

FINDING ONE

Scarce: months of watching; be ready to fly and drive it home. Why: only 2 model years; 10 years out of production; 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 plan across the 2016 tank revision.

OTHER KING AIRE FLOORPLANS

4501 · 54,000 lb · sleeps 4 4507 · 54,000 lb · sleeps 4 4513 · 54,000 lb · sleeps 4 4518 · 54,000 lb · sleeps 4 4519 · 54,000 lb · sleeps 4 4521 · 54,000 lb · sleeps 5 4531 · 54,000 lb · sleeps 5 4533 · 54,000 lb · sleeps 4 4534 · 54,000 lb · sleeps 4 4536 · 54,000 lb · sleeps 4 4537 · 54,000 lb · sleeps 4 4540 · 54,000 lb · sleeps 7 4546 · 54,000 lb · sleeps 4 4549 · 54,000 lb · sleeps 4 the whole line →

Find one for sale

Live listings for the 4503 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 King Aire line ↗

Is the 4503 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.