Used 2021 Keystone Montana 3121RL
Millstone Township, NJColonial Airstream
Questions about this 2021 Keystone Montana 3121RL
What does it cost?
Colonial Airstream lists it at $36,995.
Is it new or used?
Used. It is a 2021 model.
Is it still for sale?
Colonial Airstream’s website listed it for sale on October 31, 2026. RV Shift checks dealers’ websites about once a day, so ask the dealer to be sure.
Where is it?
At Colonial Airstream in Millstone Township, NJ. See all 48 RVs Colonial Airstream lists on RV Shift.
How many people does it sleep?
The dealer lists it as sleeping 4.
How long is it?
35' 0", with 3 slide-outs, as the dealer lists it.
How much does it weigh?
The dealer lists a dry weight (empty) of 12,273 lb and a hitch weight of 2,350 lb.
What does it take to tow it?
RV Finder’s estimate: it needs a vehicle rated to tow about 13,500 lb, with a fifth-wheel hitch. That is its 12,273 lb dry weight plus 1,200 lb for water and gear, rounded up to the next 100 lb. RV Finder shows whether it is within your vehicle’s published rating, from the maker’s own towing guide, and checks tongue weight and payload too. Confirm your numbers in your owner’s manual and on the sticker in the driver’s door jamb. Check it in RV Finder
How do I ask the dealer about it?
Use the Check availability form on this page. Your message comes to RV Shift and we pass it to Colonial Airstream.
About this RV
Options Included • 3 Slide Toppers • 2 Power Awnings • 2" Hitch Receiver • 4 Seasons All-Weather Package 4 Season Package Features 35,000 BTU Furnace • 3" x 14" in-floor straight line heat duct system • Coleman Mach® power saver 15,000 BTU Whisper Quiet main air conditioner system, bedroom • Coleman Mach® power saver 15,000 BTU Whisper Quiet main air conditioner system, living room • Wired and framed for 3rd air conditioner • 16,500 BTU heat pump on main air conditioner • Tested and approved for 0° usage • Two attic vents for cross-ventilation • Insulated and heated holding tanks and dump valves • Insulated in-floor water lines • Enclosed and heated low point drains • 12V electric tank heaters • 12V ceiling fan w/ wall controls (select models) • 48" LED fireplace Keystone Montana fifth wheel 3121RL highlights: • Hide-A-Bed Sofa • Dinette with Four Chairs • Kitchen Island • Coffee Station • Residential Refrigerator • Fireplace With this Montana fifth wheel, you can have adventures any time!
Specifications as listed by the dealer
- Type
- Fifth wheel
- Condition
- Used
- Year
- 2021
- Make
- Keystone
- Model
- Montana 3121RL
- Stock number
- 15290B
- VIN
- 4YDF31223M4704131
- Sleeps
- 4
- Slides
- 3
- Length
- 35 ft
- Ext Height
- 13 ft 4 in
- Exterior Color
- White
- Hitch Weight
- 2,350 lbs
- Dry Weight
- 12,273 lbs
- Cargo Capacity
- 4,077 lbs
- Fresh Water Capacity
- 66 gals
- Grey Water Capacity
- 88 gals
- Black Water Capacity
- 49 gals
- Tire Size
- 16"
- Furnace BTU
- 35,000 btu
- Available Beds
- Queen
- Refrigerator Type
- Residential French Door
- Refrigerator Size
- 18 cu ft
- Convection Cooking
- Yes
- Cooktop Burners
- 3
- Shower Size
- 48" x 30"
- Number of Awnings
- 2
- Axle Weight
- 7,000 lbs
- LP Tank Capacity
- 30 lbs
- Water Heater Capacity
- 12 gal
- Water Heater Type
- DSI Gas/Electric
- AC BTU
- 30,000 btu
- TV Info
- LR 50" LED HDTV, BR 32" LED HDTV
- Awning Info
- 10' & 16' Electric with LED Lights
- Axle Count
- 2
- Washer/Dryer Available
- Yes
- Number of LP Tanks
- 2
- Shower Type
- Shower w/Seat
- Electrical Service
- 50 amp
Features
- Color-coded unified wiring standard
- 4G LTE and Wi-Fi prep
- Tuf-Lok™ thermoplastic duct joiners
- KeyTV™ multisource signal controller
- In-floor heating ducts
- Tru-fit™ slide construction
- 12" I-beam w/ z-frame technology
- Road Armor™ shock absorbing hitch pin
- Hitch Vision™ w/ LED lighting
- 2" thick CNC routed, dual-layered lauan, high-gloss fiberglass sidewalls w/ double laminated & insulated rear wall
- Frameless tinted safety glass windows
- Dual pane frameless windows w/ safety tint (Optional)
- MaxTurn™ front cap w/ KeyShield™ automotive-grade paint
- Fully walkable roof w/ Alpha seamless TPO membrane system and 5" rafters
- Rear ladder
- Hydraulic slideouts on main level w/ individual selector valves & electric slideouts on upper deck
- Insulated underbelly w/ forced hot air & electric tank heaters
- 7000 lb Dexter Gladiator® thick wall axles w/ upgraded springs & Nev-R-Adjust® brakes
- Road Armor™ suspension w/ 360° vibration control
- Premium Sailun G-rated tires w/ 6-year manufacturer warranty & Tredit Care Plus roadside assistance
- Spare tire
- Ground Control® 6 point hydraulic auto-leveling w/ hitch memory
- 6' 4" tall 30" wide entry door w/ screen defender & friction hinge
- MORryde® Step Above® entry steps w/ strut assist
- Large pass through storage w/ oversized slam latch door (Select Models)
- MORryde® premium oversized rear steel slide out storage tray (Select Models)
- Side & back-up camera prep
- 2nd battery disconnect dedicated to residential refrigerator (inverter models)
- Water connections, black tank flush, outside shower w/ quick connect hose, winterization kit, water heater bypass, power tank fill, waste & water handle valves, 110V outlet,…
- Generator prep (Optional)
- LP generator (Optional)
- Seamless roto-cast holding tanks
- Outdoor kitchen (Select Models)
- Pull-out exterior kitchen (Select Models)
- 50 Amp electrical service w/ detachable cord & 110v exterior outlet
- Outside shower w/ quick disconnect hose
- Dometic 12V electric patio awning(s) w/ LED lights and awning arm power strip
- 2nd Dometic 12V electric patio awning(s) w/ LED lights and awning arm power strip
- Slide-out awning package (Optional)
- 3000 lb towing hitch (Select Models)
Listing and photos: Colonial Airstream. Details come from the dealership and can change; confirm them before you buy.