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Just did a road trip to Spokane and back and didn't notice any shudder or shaking at those speeds. I did notice it being a little bouncy at 70 mph. It's probably the tires. Goin to try and sort that out by rebalancing and maybe a little more air.

Late to the party. I don't have the max towing. Payload capacity is 1600 lb.

I may re-think or change what I use for fuel treatment. I noticed that the stations where I live have switched to 100% renewable diesel. I've read good things about the fuel vs bio-diesel and diesel #2. Seems adding a cetane booster is overkill. But still concerned about lubricity.

I've had diesels before and always used additives. With nothing but biodiesel available where I live, I currently use Opti-Lube XPD. It makes a difference IMO. Seems to run smoother and quieter, even during regens.

My Sierra 1500 loves the open road. In town driving, not so much.

I'm loving the MPG so far. Haven't taken a road trip yet but will be heading up to Spokane in another week.

Did you ever figure out what was causing the vibration?