It's new, so we know the front end components are not worn. You've already done a lot. But have you had the front end alignment checked? I've heard told that Ford covers "one alignment" as if they know they can't guess how your chassis will be loaded.
I suggest you DO have it aligned but if it's at Ford, be sure they're equipped to handle, and actually understand, this Twin-I-Beam chassis. What we've learned here is that you do NOT want the CASTER set to "Factory Spec" which is at the mid-point of a range which goes up to about 7-degrees positive. Mid is about 3-degrees positive and we've found that 3 is NOT enough to make the steering want to come back to center. About the most you're likely to be able to get is around 5-degrees positive. That's because the same adjusting point also determines CAMBER and you'll drive Camber out of range with more Caster than about 5-degrees.
I say "equipped and understand" because many treat the E-Series chassis as a "Toe-Only" alignment. Caster and Camber are very important and need to be set correctly. Then Toe is set last. It's critical too, and how the Toe is set also determines if your steering wheel is centered as you drive straight.
Tell the shop you want Before and After printouts from their alignment system. It's normal for the Right/Passenger side CASTER to be a fraction of a degree more than the Left/Driver side. Don't worry if they don't come out equal, they aren't supposed to.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB