Sorry boys...There's a reason the Ford F-150 has been the best selling truck for around 40 years in a row. Ford builds the best selling heavy duty truck for a reason. Mile for mile, dollar for dollar, they build the best truck on the road. Even with the problem laden 6L PowerStroke diesel, Ford heavy duty trucks outsold Chevy and Dodge. That Dodge Cummins is great. The rest is trash.
As far as the spark plug thing...We have an '05 Expedition with the 5.4. Same engine as the trucks, and it has been flawless...Sounds sort of like the BMW final drive issue.
The reason I'm not big on Chevy interiors is due to work. My first two cop cars were Chevy Caprices. With the LT1 motors, those things had balls. However, a Caprice with 100k was talking apart inside, while a Crow Vic with the same mileage was in much better shape.
Ever wonder why the most popular police car in the country is a Ford? The few Impalas we have require rotor replacement at every brake job. The Chargers are cool looking, fast, pieces of ****. Everything from melting brake lines to bad trannies. After the demise of the Crown Victoria Police Interceptor, my department is transitioning to Ford Police Interceptor AWD SUVs.
For a while we almost went to Tahoes. Our mechanics division made us a deal to stay with Fords. The Chevys fall apart and they didn't want all the extra work. When we auction our used up cars, the Fords always bring more money.
If I was going to buy a high mileage truck, it would be a Ford. Not because of my opinion, but because of what I have witnessed.