Chassis battery

Went to crank up our motorhome the other day to run it for a little and run the generator. The chassis battery was dead. Had to start it with the switch that draws from the house batteries. Let it run for about an hour. Turned it off and tried cranking it again, but had to use the house battery switch again. I would of thought it would been enough to charge it back up. I cranked it up last month and ran it for a while without issue. I guess the colder than normal weather took its toll on it. The house batteries seem to be fine though.

Anyone know what the next step should be? Would putting it on a battery charger help? Do I try to jump start it? Will that be better? Take it to autozone and see if they can bring it back up?