01 What makes it unique
The 3531RE turns its back room into a home theater. A rear entertainment wall faces an L-shaped hide-a-bed sofa and powered theater seating across a 5,000-BTU fireplace and a Smart TV, while a floor-to-ceiling pantry with sliding glass doors anchors the galley — a residential pantry rare in a fifth wheel. The private front bedroom carries a king bed slide with storage, and slide-out rear gear-storage trays add basement access for outdoor equipment.
It is the lightest-pinned of the profiled plans. RVUSA lists a 2,480-pound dry pin — the lowest in this group — against a 3,135-pound payload, and a 13,345-pound dry weight derives a GVWR near 16,480 pounds, lighter than the 18,000-pound full-timer plans. A single 15,000-BTU Coleman Mach heat-pump air conditioner is standard, with an 18-cubic-foot residential refrigerator on a 2,000-watt inverter, a 24-inch Furrion range and a convection microwave, a 50-inch living TV and a 32-inch bedroom TV, and washer/dryer prep.
At an MSRP of $122,378 it is priced with the other mid plans but tows like a lighter one — the Montana for a couple who wants a true rear lounge and residential pantry storage without stepping up into the heaviest coaches.
02 Full specifications
Dimensions
- Exterior length
- 38' 7"
- Exterior width
- 8' 0"
- Exterior height
- 13' 4"
- Interior height
- 7' 0"
Weights
- Dry / unit base weight
- 13,345 lbs
- GVWR (max loaded)
- 16,480 lbs
- Net cargo / payload
- 3,135 lbs
- Dry pin weight
- 2,480 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
03 The Montana floorplan family
Montana is Keystone's flagship luxury fifth wheel and the best-selling luxury fifth wheel in North America. 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 3531RE 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 | Best-selling 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 the best-selling luxury fifth wheel in North America and Keystone's flagship towable. 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 fp-slug and title checked; 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 What owners & reviewers report
Rear entertainment wall
An L-shaped hide-a-bed, powered theater seating and a fireplace under a Smart TV — the back room built as a lounge rather than a bedroom.
Floor-to-ceiling glass-door pantry
A residential pantry with sliding glass doors — standing dry storage rarely found in a towable.
Lowest pin of the profiled plans
A 2,480-lb dry pin and a derived 16,480-lb GVWR — the easiest of this group to match to a truck.
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 — a simpler back room and a lower price if the entertainment wall isn’t needed.
A similar-size rear-living couples’ plan — trades the entertainment wall for a kitchen island and dual pantries.
Grand Design’s mid fifth wheel — a lighter, often half-ton-friendlier alternative to the full-size Montana.