Going to be hard to really diagnose without being there. If axle was bent I’d expect uneven wear in the old tires if it was driven regularly. Sounds like it may not have been and only used as a toy.
Like @ZetheGSD said, the leaking knuckle could be because the housing is bent and the seal no...
If you’re considering a 10hr round trip the truck must drive fine down the road. That, or you’re crazy. What happens when you let go of the wheel driving straight down a nice flat road? The steering wheel being crooked when the wheels are straight really doesn’t mean anything if you don’t have...