CamperHardlyKnowHer

Thor Motor Coach Aria 4000

Class Abuilt 2017– (in production)Mixed build tierCommon on the used market
WHAT ONE COSTS
$440,900MSRP today

Still in production — a used 2023 would run roughly $304,200.

THE SPECS
Length41.1 ft
Height (incl. A/C)12.5 ft
Width8.4 ft
Interior height7.0 ft
GVWR35,320 lb
Dry weightnot published
Sleeps8
Slide-outs3
Fresh water91 gal
Grey water70 gal
Black water51 gal
Air conditioning43,500 BTU
Solar (standard)100 W
Awning20 ft
Fuel100 gal
Engine / chassisCummins ISB-XT 6.7L 360HP/800 lb-ft, Freightliner XC-R, Allison MH-3000
GeneratorOnan RV QD 8000 diesel

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

WHERE PEOPLE SLEEP
  • King bed with Tilt-A-View inclining mechanism(Permanent)72×80
  • Hallway bunk beds (convert to closet), TV prep and USB in bunks(Permanent)28×74
  • Power drop-down hide-away overhead cockpit bunk(Stow-away)48×74
  • Driver-side leatherette sofa bed(Convertible)
HOW IT'S BUILT — 4/5
WallsLaminated fiberglass
FrameSteel
RoofWalk-on
UnderbellyEnclosed

Thor Motor Coach (Mixed tier): Thor Aria

YEAR BY YEAR — WHAT CHANGED
  • 2017Introduced
  • 2021Dual 20,000 BTU furnaces in place of a single 35,000
  • 202440,000 BTU furnace
  • 2025Bunks re-worked to convert to a closet; 100W solar standard
  • 2027MSRP $440,860
FINDING ONE

Common — usually several for sale within a day’s drive. Why: Thor Motor Coach is a volume manufacturer; 10-year production run; still in production. Estimated from build volume and production span — not a count of live listings.

THE READ

The family diesel pusher - hallway bunks, a second bath and 70 gal of grey so a crew of eight can actually stay a week.

OTHER ARIA FLOORPLANS
Is the 4000 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.