Jumping into the Fifth Wheel world - see lots of discussions about Axel upgrades and Disc Brakes -

Purchasing a Solitude 310GK - I see lots of discussion about upgrading Axels to 7000# or even 8000#. What is the benefit of the higher axel ratings?

Similar on Brakes - How much do the Disc Brakes add as compared to the factory installed brakes

thanks everyone