Thor Motor Coach Aria 3902

Name: Thor Motor Coach Aria 3902
Brand: Thor Motor Coach

Class Abuilt 2020–20Mixed build tierPatient search on the used market

WHAT ONE COSTS

$220,500est. used (2020, 6 yr old; from 3 priced floorplans of this line)

THE SPECS

Length39.9 ft

Height (incl. A/C)12.5 ft

Width8.4 ft

Interior height7.0 ft

GVWR35,320 lb

Dry weightnot published

Sleeps6

Slide-outs3

Fresh water91 gal

Grey water51 gal

Black water51 gal

Air conditioning30,000 BTU

Awning18 ft

Fuel100 gal

Engine / chassisCummins ISB-XT 6.7L 360HP, Freightliner XC-R

GeneratorOnan RV QD 8000 diesel

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

WHERE PEOPLE SLEEP

1× King bed with Tilt-A-View inclining mechanism(Permanent)72×80
1× Power drop-down overhead cockpit bunk(Stow-away)48×76
1× 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

2020Introduced and discontinued in the same model year

FINDING ONE

Patient search: weeks of watching, and probably some travel. Why: Thor Motor Coach is a volume manufacturer; only one model year. Estimated from build volume and production span, not a count of live listings.

OUR TAKE

One-year-only variant of the 3901 on the same 272" wheelbase with a shorter 18-ft awning and a reshuffled living area.

OTHER ARIA FLOORPLANS

3401 · 32,400 lb · sleeps 4 3601 · 35,320 lb · sleeps 6 3701 · 35,320 lb · sleeps 6 3702 · 35,320 lb · sleeps 4 3901 · 35,320 lb · sleeps 6 4000 · 35,320 lb · sleeps 8 the whole line →

Find one for sale

Live listings for the 3902 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 Aria line ↗

Is the 3902 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 dealer and aggregator listings, retrieved 2026-07.