Burned Neutral Wires at the Buss in the Breaker Box

You have experienced a very common problem with RVs.
2 things can cause your problem.
1: Screws not tight enough from the factory.
2: Copper under compression will crush over a period of time and create a loose connection.
Take either scenario, shake it down the road and you have a problem.
Yes the copper wires need to be cut back.
The buss bar can be cleaned with a small wire brush or replaced.
Buss bars are readily available from Home Depot & Lowes.

Richard