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Dynamax DX3 36FK

Class Cbuilt 2015–18Better build tierPatient search on the used market
WHAT ONE COSTS
$193,500est. used (2018, 8 yr old; from 5 priced floorplans of this line)
THE SPECS
Length36.7 ft
Height (incl. A/C)12.8 ft
Width8.4 ft
Interior height7.0 ft
GVWR33,000 lb
Dry weightnot published
Sleeps4
Slide-outs2
Fresh water90 gal
Grey water52 gal
Black water52 gal
Air conditioning15,000 BTU
Awning18 ft
Fuel100 gal
Engine / chassisCummins ISL 8.9L turbo diesel on Freightliner M2 106, Allison 3200 TRV

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

WHERE PEOPLE SLEEP
  • 1× Rear bedroom bed(Permanent)—
  • 1× Dinette(Convertible)—
HOW IT'S BUILT: 4/5
WallsAzdel composite
FrameAluminum
RoofStandard
UnderbellyEnclosed

Dynamax (Better tier): Forest River

YEAR BY YEAR: WHAT CHANGED
  • 2015Introduced
  • 2019Dropped, effectively replaced by the 34KD
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

Front-kitchen DX3 - the layout that became the 34KD when the line was refreshed for 2019.

OTHER DX3 FLOORPLANS
32KD · 33,000 lb · sleeps 434KD · 33,000 lb · sleeps 635DS · 33,000 lb · sleeps 437BD · 33,000 lb · sleeps 637BH · 33,000 lb · sleeps 637RB · 33,000 lb · sleeps 637TRS · 26,000 lb · sleeps 637TS · 33,000 lb · sleeps 6the whole line →
Find one for sale

Live listings for the 36FK 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 DX3 line ↗

Is the 36FK 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.