CamperHardlyKnowHer

Dynamax DX3 37RB

Class Cbuilt 2017– (in production)Better build tierFindable on the used market
WHAT ONE COSTS
$476,100MSRP today

Still in production — a used 2023 would run roughly $328,500.

THE SPECS
Length40.8 ft
Height (incl. A/C)12.7 ft
Width8.4 ft
Interior height7.0 ft
GVWR33,000 lb
Dry weight26,919 lb
Sleeps6
Slide-outs3
Fresh water100 gal
Grey water52 gal
Black water52 gal
Air conditioning30,000 BTU
Solar (standard)200 W
Awning18 ft
Fuel100 gal
Generator8 kW Onan diesel

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

WHERE PEOPLE SLEEP
  • King tilt-a-bed with gel-infused memory foam(Permanent)71×78
  • Tri-fold sofa(Convertible)
  • Residential-style dinette (three-seat power theater seats optional)(Convertible)
HOW IT'S BUILT — 4/5
WallsAzdel composite
FrameAluminum
RoofStandard
UnderbellyEnclosed

Dynamax (Better tier): Forest River

YEAR BY YEAR — WHAT CHANGED
YEARSGVWRDRYMSRP
2017–1833,000 lb26,919 lb$476,142
202633,000 lb26,919 lb$448,701
  • 2017Introduced
  • 2019Length restated 41'2" to 40'9"; wheelbase 286"
  • 2023Detroit DD8 7.7L 375 hp chassis engine
  • 2026Cummins L9 returns; exterior height 12'8"
  • 2027Cummins L9 450 hp; MSRP $476,142
FINDING ONE

Findable — a few listed nationwide most weeks. Why: 10-year production run; still in production. Estimated from build volume and production span — not a count of live listings.

THE READ

Longest DX3 - a full-width rear bath with two sinks plus a half bath, and the biggest fresh tank at 100 gal.

OTHER DX3 FLOORPLANS
Is the 37RB 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.