battery

[ed cobos]

don't know if this is the right thread but here goes - we have left our trailer for over a month in storage and when we went to load it up for our summer trip i checked levels for water, tanks, etc and all the indicators were not lighting up, including the battery light. when i hooked up the trailer cable to the truck they all lit up. i have a couple of dumb questions: does this mean my batteries are dead? and will they recharge when driving? thanks for any feedback.