The door solution is posted above and I second it. Same unit as you have. As to the shut down while driving, road heat and the extreme heat from the V-10 is being sucked into your generator. The fix is to modify the generator compartment door to allow air that does not come from below (hot air) to enter the generator fan intake. Companies other than Thor have a fix kit for this and can be used on the Thor. Forrest River is one of those. It provides a duct and opening modification to do so.
Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
2015 Jeep Wrangler Toad