rptrac,
It's likely that your wheels are supposed to have a slight / \ stance however if you can actually see this with your naked eye, it's way too much.
When the shop said it was in spec, did they actually recheck the alignment, or did they just go by what the Tech said who did the alignment. Modern alignment machines will give a complete printout of the caster, camber, toe in, and thrust angles and also print out what is in spec or out of spec.
It's possible that they put the wrong vehicle ID in the machine and it reads in spec, but not for the Sport Trac?
If they are not giving you a printout from their alignment machine, you need to go somewhere else, because either they have old equipment, or incompetent people.
That negative camber sounds like the Torsion bar adjusters were modified to lower the vehicle or they are getting weak and your front end is sagging. The Camber adjusters are necessary to correct that condition, but it appears that they either did not install them or did not adjust them correctly.
Ford has Specs for the Sport Trac's alignment, and also has "Preferred" specs. It appears that the Sport Trac really needs to be set to the Preferred specs, which are much closer tollerances and some shops don't want to go to that much extra trouble.
Go somewhere else and have them check your alignment and give you the printout if your alignment is not in spec.
I had Western Auto align my Honda Accord once and it started pulling. They checked it and swore it was within manufacturer specs. I took it to the Honda dealer and they aligned it perfectly, and they even called Western Auto and told them what they had done wrong. Western Auto gave me a full refund of what they charged for their improper alignment.
...Rich