01 What Sierra is
Sierra's published pin weights spread further than its dry weights do, and that is the fact worth carrying into a dealership: nine floorplans run 10,319 to 13,864 lb dry - a 3,500 lb band - while dry pin weight runs 1,560 to 2,825 lb, nearly doubling. Two Sierras a thousand pounds apart on the scale can be most of a half-ton's remaining payload apart at the pin. Every plan on the roster ties out exactly against its published GVWR.
Across the whole Sierra roster the published dry weights run from 10,319 lbs to 13,864 lbs, cargo capacities from 2,431 lbs to 3,456 lbs, and dry pin weights from 1,560 lbs to 2,825 lbs. Exterior lengths run 36 to 44 feet. Those are Forest River's figures for a standard build, captured from the factory roster block and confirmed against each floorplan's own factory page.
Forest River publishes a GVWR for 9 of the 9 floorplans, and on 9 of those the arithmetic ties out exactly: dry weight plus cargo capacity equals the published rating to the pound. That check is run on every plan before it is profiled here, and a plan that fails it is catalogued with the disagreement printed rather than quietly corrected.
02 Floorplans profiled in depth
7 of the 9 Sierra floorplans are profiled in full below, each on its own page with the complete factory weight, dimension and tank block. The profiled set is spread across the weight range rather than taken from one end of it, so the lightest and heaviest plans in the line are both represented. Every plan profiled here publishes a full field set and, where Forest River publishes a GVWR, passes the dry-plus-cargo arithmetic check.
| Floorplan | Dry wt | Length | Cargo | Pin wt | GVWR |
|---|---|---|---|---|---|
| 3990FL | 12,439 | 43' 6" | 2,936 | 2,825 | 15,375 |
| 4003MB | 12,609 | 42' 9" | 2,891 | 2,010 | 15,500 |
| 3710HBFB | 12,649 | 42' 9" | 2,851 | 2,405 | 15,500 |
| 3800RK | 12,849 | 44' 1" | 2,651 | 2,405 | 15,500 |
| 4002FB | 12,889 | 43' 5" | 2,611 | 2,340 | 15,500 |
| 3900HBLR | 13,284 | 42' 9" | 2,801 | 2,085 | 16,085 |
| 3844QUAD | 13,864 | 42' 9" | 2,431 | 2,295 | 16,295 |
Every figure in this table is a Forest River factory publication for 2026, captured twice - from the line roster block and from each floorplan's own factory page - and cross-checked field by field. Forest River publishes no sleeping capacity, axle count, tire size or MSRP for this line, so there are no columns for them.
03 Also in the 2026 line
The remaining 2 Sierra floorplans are catalogued here from the factory's published figures. 2 of them are Forest River dealer-stock-only plans, which are real floorplans but are not orderable through the normal channel. A plan is catalogued rather than profiled when the factory has not yet published its full field set, when its own published figures disagree with each other, or simply because the profiled set is capped. Nothing in this table is estimated.
| Floorplan | Dry wt | GVWR | Cargo | Pin wt | Status |
|---|---|---|---|---|---|
| 3370RLS (dealer stock) | 10,319 | 13,560 | 3,241 | 1,560 | Dealer stock only |
| 3550BH (dealer stock) | 12,044 | 15,500 | 3,456 | 2,380 | Dealer stock only |
Catalogued plans carry the factory figures Forest River publishes and nothing else. A row reading “Not published” means the factory does not publish that field for that plan - it is never a placeholder for a figure this site could not be bothered to find.
04 How to choose
Sort this line by the constraint you actually have. If the truck is fixed, start at the weight column: the lightest plan in the roster is the 3370RLS - DSO at 10,319 lbs dry and the heaviest is the 3844QUAD at 13,864 lbs, and that spread is wide enough that the two ends are not the same buying decision. If the truck is not fixed, sort by cargo capacity instead - the 3550BH - DSO carries the most at 3,456 lbs, and payload is the number that runs out first on a long trip.
Do not sort by floorplan number. Forest River's codes encode length loosely and layout not at all, and this site does not decode them into layout claims. Two plans with adjacent numbers in this roster can differ by hundreds of pounds of dry weight and by more than that in dry pin weight, which is the figure that determines what the truck has to be.
Where Forest River publishes a floorplan description it is quoted on the plan page and identified as factory marketing copy rather than a specification. Where it publishes none, the plan page says so instead of describing a layout that nobody has verified. That is the difference between a catalogue and a brochure.
05 What to weigh before buying
What this line is
Sierra is Forest River's full-size fifth wheel, nine floorplans published, two of them dealer-stock-only. Forest River publishes dry weight, GVWR, cargo capacity, dry pin weight, all three exterior dimensions, all three tank capacities and awning size for every plan, and dry weight plus cargo capacity equals the published GVWR exactly on all nine. A floorplan description is published for four. Sleeping capacity, axle count, tire size and MSRP are not published in this channel. Sierra's destination-trailer roster is published separately by the factory and is not part of this line's figures.
The four fields Forest River does not publish
Sleeping capacity, axle count, tire size and MSRP are absent from Forest River's specification channel for Sierra. They are absent from this site too. None of the four is estimated from the segment, inferred from a sibling floorplan or lifted from a dealer listing quoting its own guess back. Tire size matters most of the four: two codes a digit apart are different tires with different load ratings, and a misread is a safety claim.
Match the truck honestly
The plans here run from 10,319 lbs to 13,864 lbs dry with dry pin weights of 1,560 lbs to 2,825 lbs. Dry weight is not towing weight - water, batteries, propane, gear and dealer-installed accessories all sit on top of it, and pin weight rises with them. For a fifth wheel the pin load comes off the truck's payload rating rather than its towing rating, which is the number most often quoted and the wrong one. Read your own door sticker, and weigh the trailer loaded the way you actually travel.
06 What every Sierra has
08 Recalls
NHTSA lists 14 recall campaigns affecting this line. The earliest was reported 7 Jul 2008 and the most recent 14 Apr 2025. 8 of them are matched on NHTSA’s own model field; the other 6 name this line in the recall text and are marked named in text below, which is a weaker match and shown as one.
| Reported | Campaign | Component | What can go wrong |
|---|---|---|---|
| 14 Apr 2025 | 25V245000 named in text | Structure | Steps that detach while in use increase the risk of injury. |
| 7 Aug 2023 | 23V559000 named in text | Service brakes | Reduced braking ability can increase the distance required to stop the vehicle, increasing the risk of a crash. |
| 29 Jul 2022 | 22V556000 named in text | Equipment | An awning that drops or extends beyond normal operation can increase the risk of injury. |
| 8 Jul 2022 | 22V486000 named in text | Equipment | An awning that drops or extends beyond normal operation can increase the risk of injury. |
| 24 May 2021 | 21V378000 | Structure | Improperly tightened bolts could cause the trailer body to detach from the chassis, increasing the risk of a crash. |
| 13 Sep 2018 | 18V624000 | Suspension | The missing bearing race may cause premature hub bearing failure, possibly resulting in a separation of the hub from the axle, thereby increasing the risk of a… |
| 15 Dec 2017 | 17V808000 named in text | Equipment | If the tires are inflated incorrectly to 110psi, it can cause premature wear of the tire, potentially causing a loss of control and increasing the risk of a crash. |
| 22 Nov 2017 | 17V756000 | Equipment | In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury. |
| 30 Jul 2015 | 15V480000 | Equipment | Inaccurate weight information can mislead an owner as to the vehicle's weight carrying capacity which could result in vehicle overloading and a crash. |
| 11 May 2015 | 15V273000 | Equipment | If the rivet shears causing the quad step to fail, the step user may fall, increasing the risk of personal injury. |
| 17 May 2013 | 13V203000 | Equipment | If the motor assembly screws shear, it is possible that the awning can unfurl unexpectedly, either while the vehicle is at rest or while in transit, increasing the… |
| 8 Oct 2010 | 10V460000 named in text | Power train | These cracks can propagate and cause the spindle TO detach from the axle tube, resulting IN the separation OF the wheel end from the vehicle, creating A road hazard… |
| 30 Sep 2009 | 09V375000 | Equipment | The unit may BE overloaded and cause tire failure which may lead TO A crash. |
| 7 Jul 2008 | 08V346000 | Equipment | IF this solution IS exposed TO AN ignition source under certain specific circumstances, IT can result IN A vehicle fire. |
Coverage is not complete, and this matters. These campaigns come from two passes over NHTSA’s public record: a query-by-query harvest of the recall API (1,556 queries, of which 0 failed and 242 returned an explicit zero), and a sweep of NHTSA’s complete recall flat file (324,909 rows), which added 107 campaigns the API harvest had missed. It missed them because the roster it worked from was built by a catalog endpoint that refuses most requests, so entire manufacturer names were never asked about — NHTSA files several Forest River sub-brands as makes of their own. Two limits remain: NHTSA sometimes files a roster under a parent name, and some matches below rest on the wording of the recall rather than its model field. Campaigns affecting only pre-2005 units fall outside this catalog’s range and are not listed. This page is a starting point, not a clearance. Check a specific VIN at NHTSA before you buy, and again before you tow.
09 Owner-reported problems
No complaint in NHTSA’s database names this line in its model field. Treat that as no report found, not as a clean record — owners file under whatever name they were sold, and a newer or lower-volume line simply has fewer owners to file.
How this count is drawn. A report is counted here only when NHTSA’s own model field names this line. What the owner typed in the description is never used to attribute a report: our line names are ordinary English words, and an owner writing “imagine my surprise when the axle went” or naming the state of Montana is not reporting a Grand Design Imagine or a Keystone Montana.
Read these as reports, not as findings. Complaints are submitted by owners and NHTSA does not verify them; no complaint here has been confirmed as a defect, and none of them is a recall. The sample is also self-selected — only owners motivated to file appear in it — so a high count tracks how many units a line sold at least as much as how well it was built. Use the pattern, not the total: a component that keeps recurring is worth inspecting on any used unit. File or search complaints at NHTSA.