Thor Motor Coach Quantum JM31

Name: Thor Motor Coach Quantum JM31
Brand: Thor Motor Coach

Class Cbuilt 2020–22Mixed build tierFindable on the used market

WHAT ONE COSTS

—price not published

The maker never published an MSRP for this floorplan. Unknown is not cheap — treat any asking price against comparable models, not against zero.

THE SPECS

Length32.3 ft

Height (incl. A/C)11.2 ft

Width8.3 ft

Interior height7.0 ft

GVWR14,500 lb

Dry weightnot published

Sleeps5

Fresh water40 gal

Grey water35 gal

Black water31 gal

Awning18 ft

Fuel55 gal

Engine / chassisFord E-450 7.3L V8

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

WHERE PEOPLE SLEEP

1× rear queen bed(Permanent)60×74
1× cab-over bunk(Permanent)54×96
1× jack-knife sofa(Convertible)—
1× 76 in dream dinette(Convertible)—

HOW IT'S BUILT — 3/5

WallsLaminated fiberglass

FrameAluminum

RoofWalk-on

UnderbellyOpen

Thor Motor Coach (Mixed tier): Thor Motor Coach

YEAR BY YEAR — WHAT CHANGED

2020Introduced
2022Final model year

FINDING ONE

Findable — a few listed nationwide most weeks. Why: Thor Motor Coach is a volume manufacturer. Estimated from build volume and production span — not a count of live listings.

THE READ

32 ft rear-queen plan with optional theater seating, sold only three years.

OTHER QUANTUM FLOORPLANS

CR24 · 11,030 lb · sleeps 5 DS24 · 11,030 lb · sleeps 3 GL24 · 12,125 lb · sleeps 4 GR22 · 12,500 lb · sleeps 5 HS31 · 14,500 lb · sleeps 5 KM24 · 11,030 lb · sleeps 5 KW29 · 14,500 lb · sleeps 5 LC19 · 11,500 lb · sleeps 3 LC21 · 12,500 lb · sleeps 4 LC22 · 12,500 lb · sleeps 5 LC25 · 12,500 lb · sleeps 5 LC26 · 14,500 lb · sleeps 5 LC28 · 14,500 lb · sleeps 5 LF31 · 14,500 lb · sleeps 7 the whole line →

Is the JM31 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 dealer and aggregator listings, retrieved 2026-07.