what gas engine? 2020 F350: 6.2 Gas or 7.3 L Gas?

I agree you don't need nor want a diesel for your application. While the larger engine would probably have better resale years from now I'm very hesitant to buy anything the first year it becomes available.
The power output of the 6.2 is more than enough for hauling around a pop-up TC. 385 HP is about 100 more than big blocks of a few decades ago. 430 pound-feet is almost as much as an 80's or 90's diesel. I think it would be enough.