01 What makes it unique
The 3231CK is a triple-slide rear-living Montana built around its galley. A solid-surface kitchen island sits between two pull-out pantries — unusual storage for a couples’ plan — with a dual-sink vanity in the bath, a private front bedroom with a king bed, and a rear lounge running a hide-a-bed sofa, power theater seating and a 5,000-BTU fireplace under a 50-inch TV. An outside kitchen adds a second cooking station for the campsite.
On weight it is one of the easier luxury Montanas to tow. RVUSA lists a 2,725-pound dry pin and a 3,511-pound payload, and a dealer-listed 13,169-pound dry weight derives a GVWR near 16,680 pounds — well under the 18,000-pound rating that the larger plans carry. A single 15,000-BTU Coleman Mach heat-pump air conditioner is standard (a triple-15K CX3 package is optional), with a 35,000-BTU furnace, a 16-gallon water heater and an 18-cubic-foot residential refrigerator on a 2,000-watt inverter.
It is the Montana for a couple who wants the brand’s luxury build and a storage-rich galley without the length, weight or price of the full-timer plans.
02 Full specifications
Dimensions
- Exterior length
- 37' 5"
- Exterior width
- 8' 0"
- Exterior height
- 13' 4"
- Interior height
- 7' 0"
Weights
- Dry / unit base weight
- 13,169 lbs
- GVWR (max loaded)
- 16,680 lbs
- Net cargo / payload
- 3,511 lbs
- Dry pin weight
- 2,725 lbs
Capacities
- Fresh water
- 70 gal
- Grey water
- 88 gal
- Black water
- 49 gal
- Refrigerator
- 18 cu ft
Construction
- Frame
- 12" I-beam · z-frame
- Walls
- 2" laminated fiberglass · lauan
- Roof
- Alpha TPO · walkable, 5" rafters
- Underbelly
- Four-Season · heated, 0° tested
Running gear
- Axles
- 2 (tandem)
- Hitch
- Fifth-wheel (in-bed)
- Suspension
- MORryde® CRE3000 · wet bolts
- Cooling
- Coleman Mach 15K · 50A
Galley & bath
- Cooktop
- 3-burner recessed
- Refrigerator
- 18 cu ft
- A/C
- 15K Coleman Mach heat-pump (triple-15K opt)
- Water heater
- Quick-recovery · gas/electric
Sleeping & layout
- Sleeps
- 4
- Slides
- 3
- Hitch type
- Fifth-wheel (in-bed)
- Primary bed
- King
Drawn to scale
Weight budget
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
Towing it
Loaded range: 15–25% of GVWR on the pin, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433). The range starts at the published dry figure, because loaded is never lighter than dry.
03 The Montana floorplan family
Montana is Keystone’s luxury fifth-wheel line. The line runs to fifteen floorplans for 2026; the six highest-demand layouts are profiled here in full, and the rest — along with the lighter, lower-profile Montana High Country sub-line — are catalogued on the line hub. The 3231CK on this page is highlighted; each other profiled plan links to its own page.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| 3123RL | 35 ft | 4 | Rear-living entry, kitchen island |
| 3100RL | 36 ft | 4 | New-2026 widebody, rear-living couples |
| 3231CK | 37 ft | 4 | Rear living, kitchen island + dual pantries |
| 3531RE | 39 ft | 4 | Rear entertainment, glass-door pantry |
| 3532SP | 39 ft | 4 | Side patio, king bed, theater seating |
| 3795FK | 40 ft | 6 | Front raised kitchen, rear full bath, sleeps 6 |
| 3623EB | 40 ft | 4 | Rear living, bike garage, four slides |
| 3761FL | 41 ft | 6 | Front living, bath-and-a-half, 5 slides |
| 3781RL | 41 ft | 4 | Rear living, kitchen island |
| 3857BR | 41 ft | 8 | Middle bunkroom + loft, family |
| 3901RK | 42 ft | 4 | Rear kitchen, bath-and-a-half, front master |
| 3915TB | 43 ft | 6 | Two full baths, bunkroom + loft |
| 3941FO | 43 ft | 6 | Front office full-timer, outside kitchen |
Montana is Keystone’s luxury fifth-wheel line. The full line runs to fifteen floorplans for 2026, plus the lighter, lower-profile Montana High Country sub-line catalogued separately on the hub. Body specifications (lengths, heights, payload, tanks, refrigerator, sleeping, slides and A/C) are RVUSA-verified against the 2026 structured spec records, each page matched to its RVUSA floorplan record by code and title; pin (hitch) weights are from the same records. Montana publishes a 18,000-pound GVWR across the luxury line; the lighter three-slide 3123RL entry carries a derived 16,580-pound GVWR, and the new widebody 3100RL has its dry weight and GVWR flagged as derived. Real loaded pin weights run higher — always weigh the loaded coach and confirm against your truck's payload and rear-axle ratings.
04 Notes on this floorplan
Kitchen island + dual pantries
A galley island flanked by two pull-out pantries — unusually deep kitchen storage for a rear-living couples’ plan.
Lighter GVWR
A 13,169-lb dry weight and a derived 16,680-lb GVWR — one of the easier luxury Montanas to match to a three-quarter-ton or one-ton truck.
Outside kitchen
A second exterior cooking station with its own prep space and storage — a campsite feature the heavier plans often drop.
GVWR derived
GVWR shown is the published dry weight plus the published payload; weigh the loaded coach and confirm the door sticker before matching it to a truck.
05 How it compares
The entry rear-living plan — lighter still and lower in price, the most accessible Montana if the dual pantries and outside kitchen aren’t needed.
A four-slide plan with a rear bike garage — more storage and slide-out room for gear.
Grand Design’s mid fifth wheel — a lighter, often half-ton-friendlier alternative to the full-size Montana.
06 Loading it for a trip
A full 70-gallon fresh tank is about 584 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 17% of the 3231CK’s 3,511 lb cargo capacity, leaving 2,927 lb (732 lb per rated berth). Across 13 Montana floorplans the water share runs 15% to 28%, and 8 give up more than this one. Nearest on that share: Montana 3100RL at 16% and Montana 3901RK at 18%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).
07 Where this floorplan sits
Closest sibling: the Montana 3123RL, nearest on the published figures. It differs on 5 of the 9 fields both publish (this plan first): length 37 ft 5 in vs 35 ft 1 in; dry weight 13,169 lb vs 12,881 lb; GVWR 16,680 lb vs 16,580 lb; cargo capacity 3,511 lb vs 3,699 lb; dry hitch weight 2,725 lb vs 2,580 lb. They match on sleeps, fresh tank, grey tank and black tank.
| Montana plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 16,680 | 4 of 13 | 16,480–18,000 |
| Dry weight (lb) | 13,169 | 2 of 13 | 12,881–15,644 |
| Cargo capacity (lb) | 3,511 | 9 of 13 | 2,095–3,970 |
| Dry hitch weight (lb) | 2,725 | 3 of 11 | 2,480–3,070 |
| Length | 37 ft 5 in | 3 of 13 | 35 ft 1 in–43 ft 0 in |
| Fresh tank (gal) | 70 | 1–12 of 13 | 70–77 |
| Grey tank (gal) | 88 | 1–11 of 13 | 88–137 |
| Black tank (gal) | 49 | 1–9 of 13 | 49–98 |
| Sleeps | 4 | 1–8 of 13 | 4–8 |
Either side of it by GVWR: Montana 3123RL is 100 lb lighter (16,580 lb GVWR); Montana 3623EB is 45 lb heavier (16,725 lb GVWR).
| Nearest Montana siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Montana 3231CK | 37 ft 5 in | 4 | 13,169 | 16,680 | 3,511 | 2,725 | 70 |
| Montana 3123RL | 35 ft 1 in | 4 | 12,881 | 16,580 | 3,699 | 2,580 | 70 |
| Montana 3531RE | 38 ft 7 in | 4 | 13,345 | 16,480 | 3,135 | 2,480 | 70 |
| Montana 3781RL | 41 ft 0 in | 4 | 14,290 | 18,000 | 3,710 | — | 70 |
| Montana 3623EB | 40 ft 2 in | 4 | 14,135 | 16,725 | 2,590 | 2,735 | 70 |
| Montana 3532SP | 39 ft 2 in | 4 | 14,405 | 16,500 | 2,095 | 2,730 | 70 |
All 13 Montana floorplans: Montana line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| 3231CK | 16,680 | 13,169 | 4 | 37 ft 5 in |
| Columbus 388FKH | 16,685 | 14,414 | — | 42 ft 10 in |
| Montana High Country 385BR | 16,685 | 13,794 | 10 | 40 ft 9 in |
| Puma Mesa 388FKH | 16,685 | 14,414 | — | 42 ft 10 in |
| Cedar Creek 361RL | 16,625 | 14,004 | 4 | 39 ft 7 in |
| Wolf Pack 352PACK15 | 16,745 | 12,768 | — | 45 ft 0 in |
| Pinnacle 32RLTS | 16,600 | 13,645 | 4 | — |
Against the 3231CK: the Columbus 388FKH is 5 lb heavier and 5 ft longer; the Montana High Country 385BR is 5 lb heavier and 3 ft longer and sleeps 6 more; the Puma Mesa 388FKH is 5 lb heavier and 5 ft longer.
08 Common questions about the 3231CK
How much does the 3231CK weigh?
13,169 lb dry; 16,680 lb GVWR, the most it may weigh loaded.
How much can the 3231CK carry?
3,511 lb, 21% of its GVWR (median across 307 fifth wheels here: 19%). A full fresh tank uses 584 lb of it.
What is the pin weight of the 3231CK?
2,725 lb dry, 21% of the dry weight (median across 386 fifth wheels here: 19%).
What size tow vehicle does the 3231CK need?
A tow rating of at least 16,680 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the 3231CK sleep?
It is rated to sleep 4. 5 of the 13 Montana floorplans that publish a count sleep more.
What are the tank capacities on the 3231CK?
Fresh 70, grey 88, black 49 gallons. Off hookups, fresh water runs out first.
How long is the 3231CK?
37' 5" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
16 of the 18 fields this catalogue tracks are published for the 3231CK. Not published: tire specification, awning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: keystonerv.com, library.rvusa.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 34 recall campaigns and 154 owner complaints against the Montana line. They are counted separately: a recall is a confirmed defect with a remedy, a complaint one owner’s unverified account.
What to look at on a used one. Across the 154 complaints filed on this line the most-reported components are tires (32%), structure (17%) and equipment (16%).
Recall coverage here is not complete, and complaints are owners’ unverified reports (how this record is built). Check a specific VIN at NHTSA before you buy. Full tables are on the Montana line page.