I am reporting a serious and repeated safety defect involving Hehr side windows installed on my 2018 Thor Palazzo 36.1 motorhome (VIN: [XXX] ). Multiple operable side windows on this RV have experienced adhesive bond failure between the scissor arm/operator mechanism and the vent glass pane. This has caused windows to partially detach and violently flap while driving at highway speeds. One rear bathroom window completely detached and flew off the RV during highway travel in 2022. Additional adhesive failures have continued occurring from 2023 through 2025 involving: - Kitchen window - Living room window - Dinette window - Rear bathroom window (including replacement assembly) In several incidents, I was forced to pull onto the highway shoulder to perform emergency temporary repairs using tape and adhesive to prevent windows from fully detaching from the vehicle. In December 2025, while driving near [XXX] , the rear bathroom vent window again separated from the operator arm while traveling at highway speed despite prior repair work. The window was violently flapping in the wind and appeared at risk of completely detaching from the RV. This defect creates a serious road hazard because detached glass/window components could strike nearby vehicles or motorists. I am aware of prior Hehr/Lippert recalls involving adhesive-related window failures, but I have not found a recall covering this specific failure point involving separation between the operator arm and vent glass. The defect appears widespread across multiple windows on the RV and has persisted despite repeated repair attempts. I believe this issue warrants investigation and possible expansion of existing Hehr/Lippert window recalls. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The worst 2017 Thor Motor Coach Palazzo problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Body5
- Visibility2
- Lights1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Body5
- Visibility2
- Lights1
Recalls 2
Equipment: recreational vehicle/trailer
- What is wrong
- Thor Motor Coach (TMC) is recalling certain 2015-2023 Palazzo recreational vehicles. The front lower cap brackets that support the front fiberglass panel may become loose and detach from the vehicle while in motion.
- Risk
- A detached bracket can become a road hazard, increasing the risk of a crash.
- Remedy
- Dealers will inspect and replace the front lower brackets, as necessary, free of charge. Owner notification letters were mailed March 15, 2023. Owners may contact TMC customer service at 1‑877‑855‑2867. TMC's number for this recall is RC000291.
Recall number 23V113000 · Recall details
Exterior lighting: turn signal
- What is wrong
- Thor Motor Coach (TMC) is recalling certain 2017-2020 Aria, Venetian and Tuscany, 2017 Tuscany XTE and 2017-2019 Palazzo motorhomes vehicles that received an inspection-only remedy for recall 18V‑763. The rear mounted Power Distribution Module (PDM) may have been damaged during manufacturing, possibly resulting in the rear marker lights, brake lights, or turn signals not functioning.
- Risk
- Non-functioning exterior marker lights can increase the risk of a crash.
- Remedy
- TMC will notify owners, and Daimler Trucks dealers will replace the PDM, free of charge. Owner letters were mailed October 6, 2021. Owners may contact TMC customer service at 1‑877‑855‑2867. TMC's number for this recall is RC000196.
Recall number 20V418000 · Recall details
See all 2 recalls for the 2017 Thor Motor Coach Palazzo
Defect investigations
Trimark 060-1650 Door Latch Failures
On November 23, 2020, the Office of Defects Investigation (ODI) opened PE20021 to investigate allegations of inoperative Trimark THP 060-1650 door lock/latches originally equipped on model years (MY) 2015-2017 Class A and Class C motorhomes.ODI received forty-six Vehicle Ownerâs Questionnaires (VOQs) describing consumers being locked in or out of their vehicles.The door latch, containing a die-cast zinc plunger, was produced by Equality during calendar years 2014-2016. The die-cast may become porous and brittle over time and can break without warning, causing the vehicle owner to be unable to open the recreational vehicle door equipped with the latch.If the motorhome does not have any other doors such as some Class A models, occupants could be trapped inside, needing to climb out using the emergency exits. If locked out, owners would be unable to easily get in and retrieve children and pets. ODI analyzed the data provided by Trimark in response to its January 27, 2021 information request letter.Although an elevated failure rate was evident on a specific combination of plunger bolt, door lock/latch assembly and door, the data showed that most failures occurred within the first two years of service on the affected 2015-2017 vehicles.This data suggests that component failures generally would have already occurred.Further, ODI data reflects a downward trend in complaints after calendar year 2018 and for post- MY 2016 vehicles.This downward trend may be attributed Trimark's actions in 2016 such as changes in the manufacturing process of its zinc plunger component for the relevant population and its 2016 decision to switch to a steel plunger. In view of the nature of early-life failure, and failure rate trending downward for model years 2017 and newer, this Preliminary Evaluation (PE) is closed. The closing of this investigation does not constitute a finding by the federal safety agency that a safety-related defect does not exist.The Agency reserves the right to take additional action if warranted by future circumstances. To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to
PE20021
Technical service bulletins for the 2017 Thor Motor Coach Palazzo 1
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
What 2017 Thor Motor Coach Palazzo owners say
Most recent owner complaints, unedited.
AS I was driving mr rv. down the road , the rear side window just fell off onto the roadway. I believe the window is made by lippert. On the rv forum there are a lot of people experiencing this same problem.
The contact owns a 2017 Thor Motor Coach Palazzo RV. The contact stated while operating the vehicle, the rear marker light, and the driver side(left turn) signal were inoperable. The vehicle was taken to the local dealer to be serviced under the federal safety agency Campaign Number: 21V00H000 (Electrical System, Exterior Lighting) which would address the failures but after the recall remedy was performed the failure persisted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 26,000.
While stationary, first large window behind driver's side broke off, at the top hinge, for no reason. If this had happened while driving, it could have caused serious harm to fellow motorists. At the time this happened, I was unaware of this website and the ability to report.
When parked in a parking lot after a 1hr drive, the only exit door the vehicle has did not open, preventing us from exiting the vehicle. Other campers parked in the same lot were unable to open the door form the outside but able to hand me tools to take the lock apart from the inside and open the door using pliers and a screw driver. The door latch made of a zinc or similar die casting hand broken in half preventing the retraction of the latch and keeping the door latched.
While driving the rv, the window above the sink separated. The window is double paned. The outer glass pulled away and was flapping, causing the interior glass to also start pulling away. We were on a stretch of highway that was busy with trucks, approx 6:30pm (dark), 2 lanes eastbound I-40 in california. There were no exits for 20-25 miles after the incident began. The window continued to bang and pull away the entire drive. The pull from the wind threatened to completely separate the window assembly from the rv. The highway shoulder was narrow with a drop off so we did not pull over as this would also not be a safe solution.
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Other model years
Questions about the 2017 Thor Motor Coach Palazzo
Is the 2017 Thor Motor Coach Palazzo reliable?
Owners have filed 6 complaints about the 2017 Thor Motor Coach Palazzo, close to a typical Palazzo model year.
What is the most common problem with the 2017 Thor Motor Coach Palazzo?
Body and structure, with 5 complaints. Next is visibility (2).
How many recalls does the 2017 Thor Motor Coach Palazzo have?
2 recalls, covering equipment and exterior lighting.
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