Bought our motorhome last February, and while storing it for six months always shutting off both chassis and house batteries in between the 4 weeks I would run the engine to keep it lubricated. Never had a problem starting the engine in-between the months. Now, after a month of our first full timing and while always plugged into 50 amp service I try to start the engine because we are moving in a couple days and it lugged, lugged and would not start. I am now running generator in hopes that it will charge the chassis battery. Should I have shut off the chassis batteries while parked the last month even though I had 50 amp service or does that not keep chassis batteries charged and on house one? Or on the other hand does this indicate a chassis battery in need of replacing?.