01 What makes it unique
Heartland lists the 2027 Milestone 37MB at 15,130 lb dry, a GVWR of 17,900 lb, a net carrying capacity of 2,770 lb and a pin weight of 2,920 lb. Its dry weight plus its carrying capacity comes to exactly its GVWR.
It is 43' 8" long and 13' 3" high. Heartland prints its tanks as 75 gal fresh, 87 gal grey, 50 gal black.
Every number on this page was read on 8 Nov 2026 from Heartland’s own 2027 Milestone model page for the Milestone 37MB, whose heading names the model year 2027.
How the 37MB differs from the other eight Milestone floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2027). How these ranks are worked out.
- GVWR, 17,900 lb: highest of nine; next is the 39TB (17,700 lb).
- Cargo capacity, 2,770 lb: largest of three; next is the 36RK (2,340 lb).
- Dry weight, 15,130 lb: second-heaviest of nine, between the 36RK (13,660 lb) and the 39TB (15,375 lb).
- Pin weight, 2,920 lb: second-heaviest of nine, between the 39TB (2,815 lb) and the 380DSL (3,175 lb).
- Length, 43 ft 8 in: second-longest of nine, between the 39TB (43 ft 6 in) and the 370FLMB (44 ft 2 in).
- Pin weight as a share of dry weight, 19.3%: fourth-smallest of nine, between the 36RK (18.9%) and the 377MB (20.2%).
- Exterior height, 13 ft 3 in: lowest of nine, level with the 370FLMB, 380DSL and 386BH; next are the 321FL, 333MB and 36RK (13 ft 4 in).
Next to the 36RK, the nearest lighter floorplan by dry weight, the 37MB is 1,470 lb heavier by dry weight, has a GVWR 1,900 lb higher, has 430 lb more cargo capacity, has a pin weight 340 lb heavier, is 3 ft 7 in longer, stands 1 in lower and sleeps six more; the two publish the same fresh tank, grey tank and black tank.
Next to the 39TB, the nearest heavier floorplan by dry weight, the 37MB is 245 lb lighter by dry weight, has a GVWR 200 lb higher, has 1,541 lb more cargo capacity, has a pin weight 105 lb heavier, is 2 in longer, stands 3 in lower, has a grey tank 50 gal smaller and has a black tank 50 gal smaller; the two publish the same fresh tank and sleeping capacity.
02 Full specifications
Dimensions
- Exterior length
- 43' 8"
- Exterior height
- 13' 3"
- Exterior width
- 8' 6"
- Interior height
- Not published by Heartland
Weights
- Dry / unit base weight (UVW)
- 15,130 lb
- GVWR (max loaded)
- 17,900 lb
- Net cargo / payload (CCC)
- 2,770 lb
- Hitch / pin weight
- 2,920 lb
Capacities
- Fresh water
- 75 gal
- Grey water
- 87 gal
- Black water
- 50 gal
Running gear
- Hitch type
- Fifth wheel (pin box)
- Tire size
- Not published by Heartland
Sleeping & layout
- Sleeps
- Up to 8
- Model year (as printed)
- spec-table “Year” row 2027; page title “37MB 2027 - Heartland RV”
- Axles
- 2 x 8,000
- LP Tank Capacity
- 60 lbs
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
Weight budget
Size, with end view
Holding tanks
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 (17,900 lb) and the upper loaded pin estimate (4,475 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
The Milestone floorplans below were added from Heartland’s 2027 Milestone model page; every Milestone floorplan on this site, every model year, is listed on the Milestone hub.
| Floorplan | Nominal | Sleeps |
|---|---|---|
| Milestone 36RK | 40' 1" | Up to 2 |
| Milestone 37MB | 43' 8" | Up to 8 |
| Milestone 39TB | 43' 6" | Up to 8 |
The Milestone floorplans below were added from Heartland’s 2027 Milestone model page; every Milestone floorplan on this site, every model year, is listed on the Milestone hub.
04 Notes on this floorplan
What Heartland does not publish for the Milestone 37MB
Heartland prints no tire size and interior height 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
The weight label every RV trailer carries by law (49 CFR 571.110 and 571.120) governs the towing decision, not this page.
05 How it compares
13,660 lb dry and 16,000 lb GVWR, against this model’s 15,130 lb and 17,900 lb.
15,375 lb dry and 17,700 lb GVWR, against this model’s 15,130 lb and 17,900 lb.
06 Loading it for a trip
A full 75-gallon fresh tank is about 622 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 22% of the Milestone 37MB’s 2,770 lb cargo capacity, leaving 2,148 lb (268 lb per rated berth). Across 3 Milestone floorplans the water share runs 22% to 51%, and this plan’s is the lowest. Nearest on that share: Milestone 36RK at 27%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).
07 Where this floorplan sits
Closest sibling: the Milestone 380DSL, nearest on the published figures. It differs on 4 of the 5 fields both publish (this plan first): length 43 ft 8 in vs 43 ft 4 in; dry weight 15,130 lb vs 12,865 lb; GVWR 17,900 lb vs 15,000 lb; hitch weight 2,920 lb vs 3,175 lb. They match on sleeps.
| Milestone plans | This plan | Position, low to high | Range |
|---|---|---|---|
| GVWR (lb) | 17,900 | 9 of 9 | 15,000–17,900 |
| Dry weight (lb) | 15,130 | 8 of 9 | 10,845–15,375 |
| Cargo capacity (lb) | 2,770 | 3 of 3 | 1,229–2,770 |
| Hitch weight (lb) | 2,920 | 8 of 9 | 2,225–3,175 |
| Length | 43 ft 8 in | 8 of 9 | 37 ft 10 in–44 ft 2 in |
| Grey tank (gal) | 87 | 1–2 of 3 | 87–137 |
| Black tank (gal) | 50 | 1–2 of 3 | 50–100 |
| Sleeps | 8 | 4–9 of 9 | 2–8 |
Either side of it by GVWR: Milestone 39TB is 200 lb lighter (17,700 lb GVWR).
| Nearest Milestone siblings | Length | Sleeps | Dry (lb) | GVWR (lb) | CCC (lb) | Hitch (lb) | Fresh (gal) |
|---|---|---|---|---|---|---|---|
| Milestone 37MB | 43 ft 8 in | 8 | 15,130 | 17,900 | 2,770 | 2,920 | 75 |
| Milestone 380DSL | 43 ft 4 in | 8 | 12,865 | 15,000 | — | 3,175 | — |
| 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 36RK | 40 ft 1 in | 2 | 13,660 | 16,000 | 2,340 | 2,580 | 75 |
All 9 Milestone floorplans: Milestone line hub.
| Other lines, nearest by GVWR | GVWR (lb) | Dry (lb) | Sleeps | Length |
|---|---|---|---|---|
| Milestone 37MB | 17,900 | 15,130 | 8 | 43 ft 8 in |
| Nightfall 380N | 17,879 | 12,579 | — | 43 ft 7 in |
| Bighorn 38RE | 17,995 | 15,275 | 4 | 42 ft 6 in |
| Durango Gold G359ROQ | 17,995 | 15,100 | 4 | 41 ft 8 in |
| Designer 39FL | 17,995 | 14,815 | 6 | 41 ft 6 in |
| North Point 381CKRE | 17,995 | 14,805 | 4 | — |
| Puma Grand Mesa 393RL | 17,999 | 14,844 | — | 42 ft 4 in |
Against the Milestone 37MB: the Nightfall 380N is 21 lb lighter; the Bighorn 38RE is 95 lb heavier and 1 ft shorter and sleeps 4 fewer; the Durango Gold G359ROQ is 95 lb heavier and 2 ft shorter and sleeps 4 fewer.
08 Common questions about the Milestone 37MB
How much does the Milestone 37MB weigh?
15,130 lb dry; 17,900 lb GVWR, the most it may weigh loaded.
How much can the Milestone 37MB carry?
2,770 lb, 15% of its GVWR (median across 491 fifth wheels here: 19%). A full fresh tank uses 622 lb of it.
What is the pin weight of the Milestone 37MB?
2,920 lb as published, 19% of the dry weight (median across 727 fifth wheels here: 19%).
What size tow vehicle does the Milestone 37MB need?
A tow rating of at least 17,900 lb, plus payload for the loaded pin weight, passengers and cargo.
How many people does the Milestone 37MB sleep?
It is rated to sleep up to 8. No other Milestone floorplan here is rated for more.
What are the tank capacities on the Milestone 37MB?
Fresh 75, grey 87, black 50 gallons. Off hookups, fresh water runs out first.
How long is the Milestone 37MB?
43' 8" overall, tongue or pin box included.
From the figures above.
09 What this page publishes, and what it does not
12 of the 18 fields this catalogue tracks are published for the Milestone 37MB. Not published: interior height, slide count, tire specification, awning, refrigerator, air conditioning.
Sourcing rules: methodology.
10 Manuals & documents
Sources: heartlandrvs.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.