Buying a used 04, 05, 06, 07 Fx4 supercrew
This is my first post here. I've been researching old threads, as I am about to buy a used late model Fx4 Supercrew. I've got my eye on an '05 but I'm also looking at some '04's, '06's, '07's. Ideally, I'll find something with less than 40,000 miles, and it must have the towing package installed.
So my question is this: what are the things/potential issues that I should look for and/or questions I should ask? I'm aware of the potential AC problems (not cold enough), auto-engaging front hubs at speed, etc. Are there any other big (or small) things that I should be aware of?