Rigs / Newmar / King Aire / 4558 Newmar King Aire 4558 Class A built 2023–25 Better build tier Patient search on the used market
WHAT ONE COSTS
$881,300 est. used (2025, 1 yr old; from 25 priced floorplans of this line)
THE SPECS
Length 44.9 ft
Height (incl. A/C) 13.3 ft
Width 8.5 ft
Interior height 7.1 ft
GVWR 54,000 lb
Dry weight 50,200 lb
Cargo capacity 3,800 lb
Sleeps 5
Slide-outs 3
Fresh water 105 gal
Grey water 80 gal
Black water 60 gal
Air conditioning 45,000 BTU
Fuel 165 gal
Engine / chassis Cummins X15 605 hp diesel pusher · Freightliner tag-axle
Generator Cummins 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× 84 in. sofa(Convertible) — 1× Dinette(Convertible) — HOW IT'S BUILT: 4/5
Walls Laminated fiberglass
Frame Steel
Roof Walk-on
Underbelly Enclosed
Newmar (Better tier): Newmar
YEAR BY YEAR: WHAT CHANGED
YEARS GVWR DRY MSRP 2023 54,000 lb 48,700 lb — 2024–25 54,000 lb 50,200 lb —
2023 Introduced 2026 Discontinued FINDING ONE
Patient search: weeks of watching, and probably some travel. Estimated from build volume and production span, not a count of live listings.
OUR TAKE
Three-year plan dropped for 2026 when the 4540 bunk model arrived.
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 4558 on the big marketplaces. Each search opens pre-filled with this exact floorplan:
Inventory varies by site and day. Slim pickings? search the whole King Aire line ↗
Is the 4558 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.