Newmar King Aire 4598

Name: Newmar King Aire 4598
Brand: Newmar

Class Abuilt 2016–19Better build tierScarce on the used market

WHAT ONE COSTS

$547,300est. used (2019, 7 yr old)

Sticker was $916,921 in 2018. Out of production since 2019, so the used market is the only way to buy one. Estimate assumes a 2019 unit.

THE SPECS

Length44.9 ft

Height (incl. A/C)13.3 ft

Width8.5 ft

Interior height6.9 ft

GVWR54,000 lb

Dry weight49,100 lb

Cargo capacity4,900 lb

Sleeps4

Slide-outs3

Fresh water105 gal

Grey water80 gal

Black water60 gal

Air conditioning45,000 BTU

Fuel200 gal

Engine / chassisCummins X15 605 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
2016	54,000 lb	46,300 lb	$916,921
2017	54,000 lb	47,650 lb	$916,921
2018	54,000 lb	48,600 lb	$916,921
2019	54,000 lb	49,100 lb	$916,921

2016Introduced with a 140 gal fresh tank
2018Engine to X15 605 hp, fresh tank to 105 gal
2020Discontinued

FINDING ONE

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

OUR TAKE

Four model years spanning the 600 hp to 605 hp change.

OTHER KING AIRE FLOORPLANS

4501 · 54,000 lb · sleeps 4 4503 · 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 the whole line →

Find one for sale

Live listings for the 4598 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 4598 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.