Destination
Forest River RV Sierra 401flx
Compare specs across all model years (2016–2024)
9
Model Years
4
Sleeps
40' 4"
Length
13,804
Avg GVWR
Our Recommendation
Which Year Should You Buy?
2019 Sierra 401flx
Best Choice
Highest Mint Score (33.9).
What Changed Year-Over-Year
2022
2023
More Compact
Length changed from 42' 4" to 40' 4".
2020
2021
Weight Increase
GVWR increased from 13,508 to 13,841 lbs (333 lbs heavier).
2019
2020
Weight Reduction
GVWR dropped from 13,841 to 13,508 lbs (333 lbs lighter), improving towability.
All Model Years
2024
2024 Forest River RV Sierra 401flx
33.2
13,841 lbs GVWR
1,841 lbs Hitch
40' 4"
Sleeps 4
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2023
2023 Forest River RV Sierra 401flx
33.7
13,841 lbs GVWR
1,841 lbs Hitch
40' 4"
Sleeps 4
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2022
2022 Forest River RV Sierra 401flx
33.4
13,841 lbs GVWR
1,841 lbs Hitch
42' 4"
Sleeps 4
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2021
2021 Forest River RV Sierra 401flx
32.9
13,841 lbs GVWR
1,841 lbs Hitch
42' 4"
Sleeps 4
↑ 333 lbs heavier than 2020
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2020
2020 Forest River RV Sierra 401flx
33.4
13,508 lbs GVWR
1,508 lbs Hitch
40' 10"
Sleeps 4
↓ 333 lbs lighter than 2019
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Best Value
2019
2019 Forest River RV Sierra 401flx
33.9
13,841 lbs GVWR
1,841 lbs Hitch
40' 7"
Sleeps 4
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2018
2018 Forest River RV Sierra 401flx
33.9
13,841 lbs GVWR
1,841 lbs Hitch
40' 7"
Sleeps 4
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2017
2017 Forest River RV Sierra 401flx
32.9
13,841 lbs GVWR
1,841 lbs Hitch
40' 10"
Sleeps 4
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2016
2016 Forest River RV Sierra 401flx
32.4
13,841 lbs GVWR
1,841 lbs Hitch
40' 10"
Sleeps 4
Original model year
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Can Your Vehicle Tow the Sierra 401flx?
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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