What does rear ratio in a semi means?

I would be hauling a flatbed with upto 48k cargo. Do you consider that heavy haul or regular. Lower gear ratio or higher ratio is better for that?

 

Do you think this info is correct


Truck specs 2019 or above
1720-1750 torque good for regular cargo haulers upto 48k
Equipment I will be using - flatbed
Will be doing otr mostly running flat surfaces



1720-1750 torque good for regular cargo haulers up-to 48k lbs


Frieghtliner

445-465 Hp

Gear ratio 3.08



Peterbilt

2019 579 paccar mx13 455hp 1750 torque 3.10 gear ratio 13 speed transmission

7.2 mpg @65 mph loaded

10.2 mpg@65 mph empty

Equipment~Step deck



Kenworth





Volvo

2.64 rear ratio with 12 speed