2001 Ford F150 High Mileage Good Buy? Opinions Please?

I am considering purchasing a 2001 - 2003 Ford F150 Crew Cab Pickup Truck with 100,000 miles on it. I am looking for peoples opinions out there on the reliability of this truck and if it is a good purchase.

Looking online I see quite a few of these with about 100,000 miles for a sticker price of about $9000. A quick True Market Value search in my area (WI) shows the actual value of such a truck at about $5000 - $6000 which is what I would try to pay.

I know a lot of people out there own these trucks and I would like to ask if you think It would last to say 200,000 miles or more. I read about a spark plug issue with Fords from 1997 to 2008 and wanted to know if anybody has heard of or has had this issue with their truck as well.

I know a truck will take more out of my pocket for gas money, but I am willing to pay so I can have a vehicle that I can haul cargo with and tow a small trailer. I will most often use this truck to go to and from work (about 5 miles) and on the weekends to go back and fourth to hardware stores to buy building materials like 2X4's / drywall / etc. I find myself in need of a vehicle to carry large items maybe once a month and am tired of asking all the people I know to borrow their large vehicles. Time for me to get my own. :)