Well, I had the tundra aligned with it tweaked toward a towing setting. It still had a little bit of shake. The shake is present sometimes when not towing but doesn't intrude like it does when towing. Since I'm leaving tomorrow for a 7-8 hour haul up to Watkins Glen, I decided to have the shop check out the front suspension; Ball-joints, etc. Everything was good, so his next suggestion was to replace the tires. They were Bridgestone Dueler A/Ts (p-rated), and all were pretty well cupped. So they put on some Firestone Destination LEs (C-rated). They are set at 45-psi all around. Road in on the highway this morning and the truck still shakes, perhaps more. I just don't know anymore.

Maybe it could be something in the drivetrain, but I won't be able to have that checked until after the trip. Hope I'll be safe. My credit card isn't liking this.