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Vehicle recall 21V428000 · June 4, 2021

Heartland Mallard, Heartland Prowler and 9 more models

The regulator may fail, causing an increase in propane pressure.

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary
Heartland Recreational Vehicles, LLC. (Heartland) is recalling certain 2018-2021 Mallard, Shadow Cruiser, Sundance XLTTT, Wilderness, Prowler, Trail Runner, 2018-2019 Pioneer, Terry Classic, 2020-2021 Lithium, and 2021 North Trail trailers equipped with a Winntec model 6020 two-stage propane regulator. The regulator may fail, causing an increase in propane pressure.
Consequence
Increased propane pressure can enlarge the flames in gas appliances, increasing the risk of a fire.
Remedy
Dealers will replace the regulator and test the propane system for leaks, free of charge. Owner notification letters were mailed August 3, 2021. Owners may contact Heartland customer service at 1-877-262-8032.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

Recall details

NHTSA campaign
21V428000
Reported to NHTSA
June 4, 2021
Filed by
Heartland Recreational Vehicles, LLC
Owner notification
August 3, 2021
Vehicles potentially affected
22,326
Initiated by
the manufacturer
Components
Equipment › Recreational vehicle/trailer › LPG systems
Recall 21V428000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

Has your Cruiser been repaired?

Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.

NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Cruiser dealer can also check your VIN. Recall repairs are free.