I don't know if this makes any difference, but my truck has the locking rear end.
Every truck I've driven had a limited-slip rear end except this one. It makes a huge difference when the truck is empty. If the truck wasn't a throw-away item, I'd start shopping for a salvage yard limited-slip rear end to put in it. I don't know if I would be able to find one in the stock ratio. It is 3.08, which is pretty tall.
A friend has a 69' vette. It either came with 50 series tires or the next set of tires that went on it were 50 series... either way, they are still on it. That means possibly 40+ year old tires....
They show visible dry rot from 5'. He's going to put new ones on in the spring. Good thing since above 55 mph things get shaky! (he had them re-balanced too)
I agree there are some drawbacks to running 11 year old tires, but you aren't going to take them to the track and do a bunch of laps. I don't think it's as important for a second vehicle.