Which truck to choose?

Neither.

Why?

Because all of that doesn't matter until you get the trucks tested and checked.

However I lean towards taking the Cummins, but that's me, and it would be dependent on what the dyno and all the other Due Diligence points to.

I have great luck with two engine manufacturers and stick to them. Cummins in the drive, Cummins in the RV and Cummins in the fleet.

 

Be aware of the base weight 587 is a heavy truck, mine isx Cummins/13 speed is 20,700 bobtail full of fuel.

 

I put an egr valve on mine at 706k miles, I got printout of everything done to truck from company I got it from, it’s a 13 model, other then egr and ac compresser/freeze switch no problems, but no two trucks are exactly the same

 

There is so much info out there about the ISX on how to make it batter & last longer.
Don't know anything about the Paccar, that may be good or maybe bad, dunno.
I would stick with the mainstream and go with the ISX.

 

Most definitely.

I have a relationship with three medium dealers and I've bought use trucks from them however I never take their word on anything, I just don't trust them to be truthful or accurate because one missed item, and it costs me a lot of money.

Always verify the condition of the truck, it may save you later on.

Just because it has a warranty does not mean that it will be used if the engine has a problem outside the items that they cover and more importantly it doesn't cover downtime, so you want to make sure that the truck won't break down because something they didn't tell you.

 

Get a red one. Manufacturer is unimportant.

 

With a black hood