I read that being on shore power for too long damages the batteries, would it be a good practice to disconnect the battery circuit when I am plugged into a power post?
The only to thing you really need watch is the water levels in the batteries. If you have an older style converter they tend to boil off more water per month. The newer 3 stage converters are very good at not boiling the batteries. My rig also has a trik-l-start to keep the chassis battery charged all the time while its plugged in.