01 What makes it unique
Forest River lists the 2026 Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL at 11,589 lb dry, a net carrying capacity of 2,551 lb and a pin weight of 2,140 lb. It prints no GVWR for it.
It is 43' 6" long and 13' 6" high. Forest River prints its tanks as 57 gal fresh, 62 gal grey, 30 gal black.
Every number on this page was read on 7 Nov 2026 from Forest River’s own 2026 Heritage Glen Fifth Wheels floorplan page for the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL, whose heading names the model year 2026.
How the 378FL differs from the other two Heritage Glen Fifth Wheels. Most distinctive first. How these ranks are worked out.
- Cargo capacity, 2,551 lb: smallest of three; next is the 375FAM (2,596 lb).
- Length, 43 ft 6 in: longest of three; next is the 375FAM (42 ft 9 in).
- Exterior height, 13 ft 6 in: tallest of three; next is the 325RL (13 ft 4 in).
- Dry weight, 11,589 lb: second-lightest of three, between the 325RL (10,594 lb) and the 375FAM (12,904 lb).
- Pin weight, 2,140 lb: second-lightest of three, between the 325RL (2,085 lb) and the 375FAM (2,325 lb).
- Pin weight as a share of dry weight, 18.5%: second-smallest of three, between the 375FAM (18%) and the 325RL (19.7%).
Next to the 325RL, the nearest lighter floorplan by dry weight, the 378FL is 995 lb heavier by dry weight, has 940 lb less cargo capacity, has a pin weight 55 lb heavier, is 5 ft 10 in longer and stands 2 in taller; the two publish the same fresh tank, grey tank and black tank.
Next to the 375FAM, the nearest heavier floorplan by dry weight, the 378FL is 1,315 lb lighter by dry weight, has 45 lb less cargo capacity, has a pin weight 185 lb lighter, is 9 in longer, stands 3 in taller, has a grey tank 24 gal smaller and has a black tank 30 gal smaller; the two publish the same fresh tank.
02 Full specifications
Dimensions
- Exterior length
- 43' 6"
- Exterior height
- 13' 6"
- Exterior width
- 96"
- Interior height
- Not published by Forest River
Weights
- Dry / unit base weight (UVW)
- 11,589 lb
- GVWR (max loaded)
- Not published by Forest River
- Net cargo / payload (CCC)
- 2,551 lb
- Hitch / pin weight
- 2,140 lb
Capacities
- Fresh water
- 57 gal
- Grey water
- 62 gal
- Black water
- 30 gal
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Forest River
Sleeping & layout
- Sleeps
- Not published by Forest River
- Availability (as printed)
- Forest River files this floorplan “DSO” (Dealer Stock Only): sold from dealer inventory, not orderable from the factory
- Sold under each badge (as printed)
- Forest River lists this floorplan with the same hitch weight, UVW, CCC and length on its 2026 Wildwood Heritage Glen Fifth Wheels and Salem Hemisphere Fifth Wheels rosters (saved pages)
- Model year (as printed)
- page title "2026 Wildwood Heritage Glen Fifth Wheels 378FL - DSO Floorplan - Forest River RV"
- Weight basis (as printed)
- UVW footnote: "*Estimated Average based on standard build optional equipment."
- Maker status (as printed)
- title suffix "- DSO"
- Awning
- 20'
How these published figures sit against the rest of the catalogue: fifth wheel pin weight and payload; fresh, grey and black tank sizes; camper trailer size chart.
Drawn to scale
Size, with end view
Holding tanks
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
03 The Heritage Glen Fifth Wheels floorplan family
The Heritage Glen Fifth Wheels floorplans below were added from Forest River’s 2026 Heritage Glen Fifth Wheels floorplan page; every Heritage Glen Fifth Wheels floorplan on this site, every model year, is listed on the Heritage Glen Fifth Wheels hub.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 325RL | 37' 8" | — | Profiled |
| Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL | 43' 6" | — | Profiled |
| Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 375FAM | 42' 9" | — | Profiled |
The Heritage Glen Fifth Wheels floorplans below were added from Forest River’s 2026 Heritage Glen Fifth Wheels floorplan page; every Heritage Glen Fifth Wheels floorplan on this site, every model year, is listed on the Heritage Glen Fifth Wheels hub.
04 Notes on this floorplan
What Forest River does not publish for the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL
Forest River prints no GVWR, tire size, interior height, sleeping capacity for this model, so none is given. Nothing is filled from a sibling model, a different model year or a dealer listing.
Read the label on the trailer
Federal rules put a load-carrying label inside every RV trailer: its unloaded weight with full propane, its cargo carrying capacity and its GVWR (49 CFR 571.110 and 571.120). Those figures come from the trailer itself and govern the towing decision.
05 How it compares
10,594 lb dry and Not published by Forest River GVWR, against this model’s 11,589 lb and Not published by Forest River.
12,904 lb dry and Not published by Forest River GVWR, against this model’s 11,589 lb and Not published by Forest River.
06 Loading it for a trip
A full 57-gallon fresh tank is about 473 lb of water, 19% of the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL’s 2,551 lb cargo capacity, leaving 2,078 lb. Across 3 Heritage Glen Fifth Wheels floorplans the water share runs 14% to 19%, and this plan’s is the highest. Nearest on that share: Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 375FAM at 18%.
07 Where this floorplan sits
Closest sibling: the Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 325RL, nearest on the published figures. It differs on 4 of the 7 fields both publish (this plan first): length 43 ft 6 in vs 37 ft 8 in; dry weight 11,589 lb vs 10,594 lb; cargo capacity 2,551 lb vs 3,491 lb; hitch weight 2,140 lb vs 2,085 lb. They match on fresh tank, grey tank and black tank.
| Heritage Glen Fifth Wheels plans | This plan | Position, low to high | Range |
|---|---|---|---|
| Dry weight (lb) | 11,589 | 2 of 3 | 10,594–12,904 |
| Cargo capacity (lb) | 2,551 | 1 of 3 | 2,551–3,491 |
| Hitch weight (lb) | 2,140 | 2 of 3 | 2,085–2,325 |
| Length | 43 ft 6 in | 3 of 3 | 37 ft 8 in–43 ft 6 in |
| Grey tank (gal) | 62 | 1–2 of 3 | 62–86 |
| Black tank (gal) | 30 | 1–2 of 3 | 30–60 |
Either side of it by dry weight: Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 325RL is 995 lb lighter (10,594 lb dry); Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 375FAM is 1,315 lb heavier (12,904 lb dry).
| Nearest Heritage Glen Fifth Wheels siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL | 43 ft 6 in | — | 11,589 | — | 2,551 | 2,140 | 57 |
| Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 325RL | 37 ft 8 in | — | 10,594 | — | 3,491 | 2,085 | 57 |
| Heritage Glen Fifth Wheels Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 375FAM | 42 ft 9 in | — | 12,904 | — | 2,596 | 2,325 | 57 |
All 3 Heritage Glen Fifth Wheels floorplans: Heritage Glen Fifth Wheels line hub.
| Other lines, nearest by dry weight | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL | — | 11,589 | — | 43 ft 6 in |
| Durango GoldRush Nugget | 14,500 | 11,610 | — | 40 ft 6 in |
| Chaparral 355FBX | 14,500 | 11,542 | — | 42 ft 7 in |
| Cardinal 38DEN | 14,235 | 11,638 | — | 44 ft 5 in |
| Sidewinder 3610DK | 14,995 | 11,640 | — | 38 ft 11 in |
| Wildcat 36MB | 14,335 | 11,537 | — | 42 ft 7 in |
| XLR Boost 310BX | — | 11,519 | — | 36 ft 2 in |
Against the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL: the Durango GoldRush Nugget is 21 lb heavier and 3 ft shorter; the Chaparral 355FBX is 47 lb lighter; the Cardinal 38DEN is 49 lb heavier.
08 Common questions about the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL
How much can the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL carry?
2,551 lb. A full fresh tank uses 473 lb of it.
What is the pin weight of the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL?
2,140 lb as published, 18% of the dry weight (median across 686 fifth wheels here: 19%).
What are the tank capacities on the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL?
Fresh 57, grey 62, black 30 gallons. Off hookups, fresh water runs out first.
How long is the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL?
43' 6" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
10 of the 18 fields this catalogue tracks are published for the Wildwood Heritage Glen / Salem Hemisphere Fifth Wheels 378FL. Not published: GVWR, interior height, sleeps, slide count, axle count, tire specification, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: forestriverinc.com (linked below); the full source note is at the foot of the page.