It depends on a few things, will be you using an inverter for tv's coffee pots, microwaves ect.
If not 2 6-volt house batteries and your engine battery should be fine, make sure you have a battery disconnect while parked so-as not to drain your engine starting battery. If you have room you can run 4 6-volt batteries and not even worry about solar as your house batteries should recharge on your way to your next destination.
Joe & Carol
2000 Southwind 32V
2011 Jeep JKUR - toad
2014 Honda CR-V EX-L - toad