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If you were happy with the F-150's EgoBoost performance towing the 29' TT (guessing 7500-ish lbs?) then a V-10 could be a good less expensive choice without all of the 6.0 concerns. Unless her daily driving includes lots of big smokey burnouts and stoplight drag races the 6.8 is a thirsty (in stock form mine did 14/14.5 MPG on my daily 50/50 commute and 15 highway) but super reliable motor with more than enough grunt for the jobs at hand.
I've pretty much retired my EX from daily use to extend it's life and keep it nice and now it is just our dedicated tow rig for the 11k TT, which it drags all over the East without issue.
I agree with WE3ZS, the v10 is a great option. I own 2 7.3's, and a v-10. I actually prefer to drive the v-10 on a daily basis. I also just picked up a 6.0 superduty, so we'll see how that goes.