I agree with that. I'd also replace them as a set. My point was just that if you have never had any problems with them, and don't have any problems with any of them now you probably won't have any problems over the next 20,000 miles or so. But even if you only had 100,000 miles on the truck, the chance is always present that injectors can fail. Based on my experiences, I'd definitely take at least one fuel and oil filter along, two if you can plus the oil and the tools to do a roadside change. And based on a recent experience of mine, you should definitely take at least one replacement serpentine belt with you--and the ratchet or wrench with the 1/2" drive, of course. It's one of the easiest roadside repairs there is, and you're dead in the water without it.