01 What Heartland publishes for the Milestone
Heartland Recreational Vehicles, a Thor Industries company, of Elkhart, Indiana, lists 6 Milestone fifth wheels in its 2024 Milestone brochure. Heartland prints a dry weight for every one profiled here, and each has a page of its own. It prints a GVWR for every one too. Heartland prints no cargo carrying capacity for any Milestone floorplan, and this site does not compute one. (How the data is verified.)
02 Heartland Milestone models
Heartland Milestone · 6 models
| Model | Dry weight | Cargo (CCC) | GVWR | Tongue | Length | Sleeps | On this site |
|---|---|---|---|---|---|---|---|
| Milestone 321FL | 10,845 lb | Not published by Heartland | 15,000 lb | 2,225 lb | 38' 4 1/2" | 3-4 | Profiled |
| Milestone 333MB | 11,800 lb | Not published by Heartland | 15,000 lb | 2,405 lb | 37' 10" | 3-4 | Profiled |
| Milestone 386BH | 12,456 lb | Not published by Heartland | 15,000 lb | 2,233 lb | 43' 3" | 7-8 | Profiled |
| Milestone 377MB | 12,511 lb | Not published by Heartland | 15,000 lb | 2,528 lb | 42' 11" | 7-8 | Profiled |
| Milestone 370FLMB | 12,520 lb | Not published by Heartland | 15,500 lb | 2,675 lb | 44' 2" | 7-8 | Profiled |
| Milestone 380DSL | 12,865 lb | Not published by Heartland | 15,000 lb | 3,175 lb | 43' 4 3/4" | 7-8 | Profiled |
Read from Heartland’s 2024 Milestone brochure, 5 Nov 2026. “Not published” means the maker prints no figure; nothing is filled from another model, year or dealer.
03 Reading Heartland’s figures
A maker’s published weight is for a base trailer; options and dealer-installed equipment add weight to any particular unit. The federal weight label inside the trailer carries its own unloaded weight, cargo carrying capacity and GVWR (49 CFR 567 and 571.120): read it on the unit itself before any towing decision.
05 Recalls
NHTSA lists 9 recall campaigns affecting this line. The earliest was reported 30 Nov 2018 and the most recent 27 Mar 2024.
| Reported | Campaign | Component | What can go wrong |
|---|---|---|---|
| 27 Mar 2024 | 24V236000 | Equipment | A circuit board that overheats increases the risk of a fire. |
| 8 Aug 2022 | 22V591000 | Equipment | An awning that drops or extends beyond normal operation can increase the risk of injury. |
| 17 Jun 2022 | 22V432000 | Equipment | A gas leak in the presence of an ignition source can increase the risk of a fire. |
| 19 Oct 2020 | 20V643000 | Structure | If the outriggers bend, it can negatively affect vehicle handling, increasing the risk of a crash. |
| 13 Feb 2020 | 20V084000 | Equipment | In the event of a fire, the smoke detector may not provide adequate warning for the occupants to be able to escape safely, increasing the risk of injury. |
| 20 Sep 2019 | 19V671000 | Equipment | If the bed falls while someone is on, or under, the bunk, there is an increased risk of an injury. |
| 12 Jul 2019 | 19V525000 | Electrical system | Overheating of the connection can increase the risk of a fire. |
| 17 Dec 2018 | 18V896000 | Equipment | If the LP hose contacts the tire, it can cause a propane leak, increasing the risk of a fire. |
| 30 Nov 2018 | 18V852000 | Visibility | If the reflectors are missing, the trailer may have reduced visibility to other drivers, increasing the risk of a crash. |
Coverage is not complete: this list is a starting point, not a clearance (how it is built), so check a specific VIN at NHTSA before you buy and again before you tow.
This count covers the Heartland Milestone only, not the Graco Milestone child seat.
06 Owner-reported problems
A sweep of NHTSA’s complete complaint file — every safety-defect complaint NHTSA has received since 1 January 1995, matched on NHTSA’s own model field under every name this site publishes for the line — found no complaint naming this line. 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.