Congrats on your new truck! The order process is easy like you found and can get what you want, nothing more or less. I ordered my 2022 7.3 summer of 21 and just picked up a new 25 350 6.7 HO on May 31st. I wouldn't have ordered the HO but it had everything else I wanted and they accepted my low ball offer. Sold the 7.3 for what I paid for it 5yrs ago so can't complain.
Your 11mpg towing 7k travel trailer is in the ballpark unless you were driving 55 then I'd say it's a little low. I keep my finger on the truck market pulse and the 25-27 Ford 7.3's and 6.7's will be some of the best trucks looking back 10+ yrs from now. Both engines and the 10r140 trans are dialed in at this point before the possible new diesel in 28.