2024 Keystone Montana 3121RL vs 2025 Keystone Montana High Country 331RL

Two popular options on many shoppers' shortlists — the 2024 Keystone Montana 3121RL and the 2025 Keystone Montana High Country 331RL. Let's see how they compare across the specs that matter most.

Specifications Comparison

Specification2024 Keystone Montana 3121RL2025 Keystone Montana High Country 331RLAdvantage
CategoryFifth WheelFifth Wheel
Year202420252025 Keystone Montana High Country 331RL
Length28 ft36 ft
Width8 ft8 ft
Height13 ft13 ft
Dry Weight12,000 lbs15,900 lbs
GVWR16,100 lbs18,200 lbs
Sleeping Capacity562025 Keystone Montana High Country 331RL
Fresh Water93 gal82 gal2024 Keystone Montana 3121RL
Gray Water48 gal51 gal2025 Keystone Montana High Country 331RL
Black Water39 gal41 gal2025 Keystone Montana High Country 331RL
Fuel Capacity
Horsepower
Engine
Slide-Outs122025 Keystone Montana High Country 331RL
Solar200 W300 W2025 Keystone Montana High Country 331RL
Battery200 Ah350 Ah2025 Keystone Montana High Country 331RL
Inverter2,000 W2,000 WTie
MSRP$66,000$50,0002025 Keystone Montana High Country 331RL

Detailed Comparison

Two popular options on many shoppers' shortlists — the 2024 Keystone Montana 3121RL and the 2025 Keystone Montana High Country 331RL. Let's see how they compare across the specs that matter most.

The Keystone Montana 3121RL measures 28.0 ft in length at 12,000 lbs, compared to the Keystone Montana High Country 331RL's 36.0 ft and 15,900 lbs. GVWR ratings sit at 16,100 lbs and 18,200 lbs respectively.

The Keystone Montana 3121RL sleeps 5 while the Keystone Montana High Country 331RL accommodates 6. Slide-outs play a role in livability: the Keystone Montana 3121RL has 1 and the Keystone Montana High Country 331RL has 2.

For boondocking enthusiasts, tank sizes matter. Fresh water capacity goes to the Keystone Montana 3121RL at 93 gallons versus 82 gallons. Solar-wise, you get 200W on the Keystone Montana 3121RL and 300W on the Keystone Montana High Country 331RL. Battery banks are 200 Ah and 350 Ah.

At $66,000 MSRP for the Keystone Montana 3121RL and $50,000 for the Keystone Montana High Country 331RL, the Keystone Montana High Country 331RL saves you $16,000.

If you're traveling with a family, look for the model with more sleeping positions and better storage. Boondockers: look at the fresh water capacity and solar/battery systems — they determine how long you can stay out. For the full-time RV lifestyle, every gallon of tank capacity and every inch of counter space counts.

No comparison can replace walking through each unit yourself. Visit a dealer and experience the layouts firsthand.

Individual Overviews

2024 Keystone Montana 3121RL

  • Category: Fifth Wheel
  • Length: 28 ft
  • Weight: 12,000 lbs
  • Sleeps: 5
  • MSRP: $66,000
View Full Specs

2025 Keystone Montana High Country 331RL

  • Category: Fifth Wheel
  • Length: 36 ft
  • Weight: 15,900 lbs
  • Sleeps: 6
  • MSRP: $50,000
View Full Specs