Couple newbie questions...

[Kc0stp]

Picking up my first truck (2014 Kenworth T700) next weekend and couple quick newbie questions.

First when it comes to climbing a hill with the 20psi max for fuel economy is there a speed when your better off just going full throttle due to limited fuel gains in comparison?

On the T700 it's currently a single bunk, will I just need to bolt in an upper bunk or will I also need additional brackets (won't be for a while but good info to know). And haven't had a chance to chase wires yet but are the 2 antennas on the sleeper strictly am/fm or cb as well?