My Class B is 1999 and as far as I know has the original charger, so I don't think it is particularly smart. I'm leaving it plugged in under the carport to run some anti-mouse deterrents so I disconnect the charger and monitor the battery voltage and when it drops down a little I plug the charger back in over night. Luckily they just have the charger plugged into an outlet under the jackknife couch.