01 What makes it unique
Heartland lists the 2024 Milestone 370FLMB at 12,520 lb dry, a GVWR of 15,500 lb and a pin weight of 2,675 lb. Heartland prints no cargo carrying capacity for it, so none is given here; the federal label inside the trailer carries one.
It is 44' 2" long and 13' 3" high. Heartland prints no tank capacity for it.
Among the 6 Milestone floorplans Heartland’s 2024 Milestone brochure lists with a published dry weight, it is number 5 from the lightest, in a range from 10,845 lb (Milestone 321FL) to 12,865 lb (Milestone 380DSL). Every figure in that comparison is Heartland’s, for the same model year.
Every number on this page was read on 5 Nov 2026 from Heartland’s 2024 Milestone brochure, the maker’s own dated document for model year 2024.
How the 370FLMB differs from the other five Milestone floorplans. Most distinctive first. How these ranks are worked out.
- GVWR, 15,500 lb: highest of six; next are the 321FL, 333MB and three others (15,000 lb).
- Length, 44 ft 2 in: longest of six; next is the 380DSL (43 ft 4 in).
- Dry weight, 12,520 lb: second-heaviest of six, between the 377MB (12,511 lb) and the 380DSL (12,865 lb).
- Pin weight, 2,675 lb: second-heaviest of six, between the 377MB (2,528 lb) and the 380DSL (3,175 lb).
- Pin weight as a share of dry weight, 21.4%: second-largest of six, between the 321FL (20.5%) and the 380DSL (24.7%).
- Exterior height, 13 ft 3 in: lowest of six, level with the 380DSL and 386BH; next are the 321FL and 333MB (13 ft 4 in).
Next to the 377MB, the nearest lighter floorplan by dry weight, the 370FLMB is 9 lb heavier by dry weight, has a GVWR 500 lb higher, has a pin weight 147 lb heavier, is 1 ft 3 in longer and stands 3 in lower.
Next to the 380DSL, the nearest heavier floorplan by dry weight, the 370FLMB is 345 lb lighter by dry weight, has a GVWR 500 lb higher, has a pin weight 500 lb lighter and is 10 in longer; the two publish the same exterior height.
02 Full specifications
Dimensions
- Exterior length
- 44' 2"
- Exterior height
- 13' 3"
- Exterior width
- Not published by Heartland
- Interior height
- Not published by Heartland
Weights
- Dry / unit base weight (UVW)
- 12,520 lb
- GVWR (max loaded)
- 15,500 lb
- Net cargo / payload (CCC)
- Not published by Heartland
- Hitch / pin weight
- 2,675 lb
Capacities
- Fresh water
- Not published by Heartland
- Grey water
- Not published by Heartland
- Black water
- Not published by Heartland
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Heartland
Sleeping & layout
- Sleeps
- 7-8
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 (no width published)
Axles, wheels and nose shape are schematic; not a floorplan. Data: dataset.
Towing it
Check your vehicle. Enter the ratings from your owner’s manual and the door-pillar placard.
Compares your figures with this page’s published GVWR (15,500 lb) and the upper loaded pin estimate (3,875 lb, a rule of thumb). Your vehicle’s placard and the trailer’s own weight label govern.
Loaded range: 15–25% of GVWR on the pin, a rule of thumb, not a measurement of this unit. No truck ratings or hitch classes (why; NHTSA, DOT HS 809 433). The range starts at the published figure, because loaded is never lighter than that.
03 The Milestone floorplan family
Heartland’s 2024 Milestone brochure lists 6 Milestone floorplans; every one with a printed weight has a page here.
| Floorplan | Nominal | Sleeps | Notable |
|---|---|---|---|
| Milestone 321FL | 38' 4 1/2" | 3-4 | Profiled |
| Milestone 333MB | 37' 10" | 3-4 | Profiled |
| Milestone 386BH | 43' 3" | 7-8 | Profiled |
| Milestone 377MB | 42' 11" | 7-8 | Profiled |
| Milestone 370FLMB | 44' 2" | 7-8 | Profiled |
| Milestone 380DSL | 43' 4 3/4" | 7-8 | Profiled |
Heartland’s 2024 Milestone brochure lists 6 Milestone floorplans. Every one with a printed weight has a page here.
04 Notes on this floorplan
What Heartland does not publish for the Milestone 370FLMB
Heartland prints no cargo carrying capacity, tire size, interior height, grey-tank, black-tank 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
12,511 lb dry and 15,000 lb GVWR, against this model’s 12,520 lb and 15,500 lb.
12,865 lb dry and 15,000 lb GVWR, against this model’s 12,520 lb and 15,500 lb.
07 Where this floorplan sits
Closest sibling: the Milestone 377MB, nearest on the published figures. It differs on 4 of the 5 fields both publish (this plan first): length 44 ft 2 in vs 42 ft 11 in; dry weight 12,520 lb vs 12,511 lb; GVWR 15,500 lb vs 15,000 lb; hitch weight 2,675 lb vs 2,528 lb. They match on sleeps.
| Milestone plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 15,500 | 6 of 6 | 15,000–15,500 |
| Dry weight (lb) | 12,520 | 5 of 6 | 10,845–12,865 |
| Hitch weight (lb) | 2,675 | 5 of 6 | 2,225–3,175 |
| Length | 44 ft 2 in | 6 of 6 | 37 ft 10 in–44 ft 2 in |
| Sleeps | 8 | 3–6 of 6 | 4–8 |
Either side of it by GVWR: Milestone 386BH is 500 lb lighter (15,000 lb GVWR).
| Nearest Milestone siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Milestone 370FLMB | 44 ft 2 in | 8 | 12,520 | 15,500 | — | 2,675 | — |
| Milestone 377MB | 42 ft 11 in | 8 | 12,511 | 15,000 | — | 2,528 | — |
| Milestone 386BH | 43 ft 3 in | 8 | 12,456 | 15,000 | — | 2,233 | — |
| Milestone 380DSL | 43 ft 4 in | 8 | 12,865 | 15,000 | — | 3,175 | — |
| Milestone 333MB | 37 ft 10 in | 4 | 11,800 | 15,000 | — | 2,405 | — |
| Milestone 321FL | 38 ft 4 in | 4 | 10,845 | 15,000 | — | 2,225 | — |
All 6 Milestone floorplans: Milestone line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Milestone 370FLMB | 15,500 | 12,520 | 8 | 44 ft 2 in |
| Bighorn Traveler 32RS | 15,500 | 10,803 | 4 | 36 ft 2 in |
| Brookstone 374RK | 15,500 | 13,020 | — | 42 ft 2 in |
| Chaparral 367BH | 15,500 | 12,328 | — | 42 ft 6 in |
| ElkRidge 37RED | 15,500 | 11,848 | 6 | 41 ft 7 in |
| Mesa Ridge 371MBH | 15,500 | 12,665 | — | 42 ft 5 in |
| Shasta Phoenix 367BH | 15,500 | 12,328 | — | 42 ft 6 in |
Against the Milestone 370FLMB: the Bighorn Traveler 32RS is 8 ft shorter and sleeps 4 fewer; the Brookstone 374RK is 2 ft shorter; the Chaparral 367BH is 2 ft shorter.
08 Common questions about the Milestone 370FLMB
How much does the Milestone 370FLMB weigh?
12,520 lb dry; 15,500 lb GVWR, the most it may weigh loaded.
What is the pin weight of the Milestone 370FLMB?
2,675 lb as published, 21% of the dry weight (median across 686 fifth wheels here: 19%).
What size tow vehicle does the Milestone 370FLMB need?
A tow rating of at least 15,500 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the Milestone 370FLMB sleep?
Its published sleeping capacity is 7–8. No other Milestone floorplan here is rated for more.
How long is the Milestone 370FLMB?
44' 2" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
6 of the 18 fields this catalogue tracks are published for the Milestone 370FLMB. Not published: cargo capacity (CCC), exterior width, interior height, fresh tank, grey tank, black tank, slide count, axle count, tire specification, awning, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: heartlandrvs.com, library.rvusa.com (linked below); the full source note is at the foot of the page.
11 NHTSA safety record
NHTSA holds 9 recall campaigns against the Milestone line (a recall and a complaint are not the same thing).
Recall coverage here is not complete, and complaints are owners’ unverified reports (how this record is built). Check a specific VIN at NHTSA before you buy. Full tables are on the Milestone line page.
Owner’s manuals
The maker’s own owner’s manual for each model year on this page, linked where the maker publishes it. Each link goes to the maker’s file, labelled as the maker labels it; a year with no manual of its own is not filled from another year.
| Model year | Manual |
|---|---|
| 2024 | General Owner's Manual for 2025 or before (PDF on heartlandrvs.com; the maker’s one manual for all its products that year, not a manual written for this line alone) |