Again, Ford has for years not given any options on oil use. No charts and bars related to temps. One grade is recommended only. From model year '97 to 2001, the recommended oil grade was 5w30. After it, is 5w20. No exceptions are made in the owners manual.
That being said, no changes were made to the engines between 2001 and 2002. 5w20 is also listed as backwards compatible in these engine applications in a TSB.
What that means to me is:
5w30 or 5w20 will work fine in these engines, no questions asked.
10w30 will work fine in warmer climates, which yours certainly qualifies as.
If you are towing, you are on the severe service schedule, which calls for 3,000 mile oil changes.
I'm sure the 5w20 will work fine in that short of an interval, even in the heat. If your nervous, the Mobil 1 5w30 or 10w30 are also good choices. Service intervals could be extended with analysis.