Unless you have differential fluid leaking out DON'T PULL THE HUB, use the zippered boots (they work fine) and be done in about an hour.
When did 'if it ain't broke, don't fix it' become bad advice?
Nothing in the hub pull down will be found that cannot be diagnosed without pulling it apart.
I think the issues that people had with zippered boots are self induced (not cleaning, rips, rings popping off). Nick a seal with the axle on reassembly and you get to do it all over again.. and spend even more money on something that wasn't even broke to begin with.
And do you have a torque wrench rated to torque those bolts? I don't. What about a hub socket? New outer seal? A new tub of grease (the grease in my hub was still good, not caked up.... why replace good grease with good grease?) Money down the drain.
Unless you are simply bent on becoming a member of the 'i don't use no stinking zippered boot' club.. get a zippered boot, put it on and drive your truck.
I have about 50 miles and 3 weeks on my front drivers side zippered boot.. has not ripped, torn, popped off, leaked... its just there.. being all boot like.