-Entry door of travel trailer opens during travel even with both deadbolt & handle locks in locked positions. -This could allow items inside travel trailer to be sucked out onto roadway. That could lead to property damage, injuries, & even death to myself, my passengers, & any other vehicle on the same roadway as me. Potentially making impact with road signs, other vehicles, bicyclists, or even pedestrians on side of roadway. This has also allowed diesel exhaust soot to be sucked inside the travel trailer, coating the ENTIRE interior. Created slip/fall hazard (I nearly fell) as it made the vinyl flooring incredibly slick. Harmful to health (covered the toilet seats, furniture, cookware, etc. I had to clean EVERY surface of the trailer interior to prevent harm to myself & my labradoodle (began to lick himself to remove soot picked up from interior surfaces). Multiple albuterol inhalations required during cleanup due to my asthma. -Multiple occurrences even after multiple dealership service visits. Issue first appeared within 100mi. of purchasing travel trailer brand new. -Adventure RV Cheyenne, WY (Blue Compass) verified issue & replaced under warranty entire entry door. -I contacted Grand Design to open a complaint ticket. I requested permission to have trailer inspected and issue resolved at Windish RV in Longmont, CO as the Cheyenne dealership was incompetent, dishonest, & failed to fix this. Windish RV was fantastic, but Grand Design refused to authorize further action fo