Why did my F150 stall out while driving?

What is your question?

I was towing a trailer with 4 motorcycles from Michigan to Florida. Near Savannah Georgia I was getting off to get gas and the truck stalled on the off ramp. When trying to restart, it would start and immediately stall out. After 15 minutes it started and I was able to drive all the way to New Smyrna Beach Florida. I took the truck to Ford dealership where they replaced the perge valve. 10 days later with no issues I proceeded to return back to Michigan towing the same trailer and motorcycles. I made it all the way to Lima Ohio before it stalled on the off ramp again. It did the same thing so I waited. I finally made it to my destination with it stalling 2 more times. I have it at the dealer for service but they cant find anything wrong with it. No codes etc. Any idea what the problem can be?

What makes this problem better or worse?

Towing

How long has your 2019 Ford F-150 had this problem?

Just started on trip to bikeweek.