Fifth Wheel
Keystone RV Alpine 3700fl
Compare specs across all model years (2018–2025)
8
Model Years
6
Sleeps
41' 5"
Length
16,574
Avg GVWR
Our Recommendation
Which Year Should You Buy?
2025 Alpine 3700fl
Best Choice
Highest Mint Score (29.9). Most recent model year with latest updates.
What Changed Year-Over-Year
2024
2025
Weight Increase
GVWR increased from 16,500 to 17,090 lbs (590 lbs heavier).
2023
2024
Larger Fresh Tank
Fresh water capacity changed from 54 to 75 gallons.
2020
2021
Tank Capacity Change
Fresh water capacity changed from 66 to 54 gallons.
All Model Years
Best Value
2025
2025 Keystone RV Alpine 3700fl
29.9
17,090 lbs GVWR
3,080 lbs Hitch
41' 5"
Sleeps 6
↑ 590 lbs heavier than 2024
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2024
2024 Keystone RV Alpine 3700fl
29.2
16,500 lbs GVWR
3,080 lbs Hitch
41' 5"
Sleeps 6
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2023
2023 Keystone RV Alpine 3700fl
28.7
16,500 lbs GVWR
2,775 lbs Hitch
41' 6"
Sleeps 6
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2022
2022 Keystone RV Alpine 3700fl
29.7
16,500 lbs GVWR
2,775 lbs Hitch
41' 6"
Sleeps 6
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2021
2021 Keystone RV Alpine 3700fl
29.7
16,500 lbs GVWR
2,775 lbs Hitch
41' 5"
Sleeps 6
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2020
2020 Keystone RV Alpine 3700fl
29.4
16,500 lbs GVWR
2,775 lbs Hitch
41' 5"
Sleeps 6
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2019
2019 Keystone RV Alpine 3700fl
29.7
16,500 lbs GVWR
2,950 lbs Hitch
41' 5"
Sleeps 6
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2018
2018 Keystone RV Alpine 3700fl
29.4
16,500 lbs GVWR
2,775 lbs Hitch
41' 11"
Sleeps 6
Original model year
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Can Your Vehicle Tow the Alpine 3700fl?
Enter your truck specs to see if any of these model years fit your towing capacity—and which year gives you the most safety margin.
Tip: Click a year to see the full specs, tow guidance, and recommended gear for that model year.
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