Need help deciding between three different truck models

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Honestly 80 k is light , with that being said i would go with 3.90 on 22.5 or 4.10 on 24.5 .in my opinion these is how I would set up a 5 axel .I also don't drive that fast .
I am a big fan of a 18 speed especially if your in any soft ground.

Keep in mind these ratio are alot harder to find and usually have been "worked" harder.
( 24.5 were on all my trucks for clearance)
The link did not work for the star car ...
I had a 2008 9900 international i run for years and a 4900 westernstar . Both big nose trucks , the star is alot tougher but alot harder on feul . Probably 20 % worse but aslo had the 2250 instead of the 871 cummins which i aslo think made a difference.
The biggest factor is do you want to drive 75 mph hour or a 60 mph .
Everything is really a loaded question.
My 9900 was a light truck ,the lightest 18 speed , super 40s , ect .
I ran that truck on some pretty wicked offroad trails draging 140,000 lbs , heavy haul up to 200,000 lbs ., ect . Ill say again the biggest factor is YOU .
It seems like you have the right idea about everything.
Its all about finesse , not brute force .
So this is a very long answer for your question.
P.s at least a 3 way locker is a must .I think that on any truck though, lol