The 2006 Ford should be the 2nd generation V-10 (3 valve engine with 315 HP) coupled to the 5R110W five speed automatic/overdrive transmission. It has improved head design that doesn't tend to blow spark plugs. It should have 10 lug wheels, not 8. That's a good thing. It is possible that the chassis is NOT a 2006 model year so it's IMPORTANT to confirm that before you buy if you choose the Ford.
At that age, check the roof condition, in person. Look for water leaks. Seriously deduct your offer if you find ANYTHING wrong with the roof or exterior walls. (leaks, bubbles, delaminations, etc.)
Chum lee