I bought an 2008 Expedition about a month ago and cannot seem to adjust it so it doesn't pull to the right.  I have noticed this while riding on crowned and flat roads as well as parking lots and have even crossed over into the oncoming lane on crowned roads [making sure no vehicles were approaching], loosened my grip on the handlebars, and had the bike slowly drift back to the right.  I have no adjustment left in the tie rod so I guess that means that there is neither toe-in or toe-out.   I was having problems with low speed shimmy but that is almost gone since I switched to a more narrow set of tires.

I bought the bike at Richardson Bike Mart but the day I went over for test riding, their Catrike mechanic was working an event.  The guys in the shop got things close and I expect my local mechanic can take care of the other adjustments once we figure out what to do.  I wish this model had the same tie rod system as my 04 road...it was much easier to adjust.
Charles Rathbun