Need Battery Upgrade, need suggestions on what to do

[Holiday201929m]

I have a 2019 Holiday Rambler Admiral 29M and with this i have (2) 83Ah Deepcycle batteries. I bought this RV from Camping World so you know they put the cheapest batteries in there. This weekend we went to the lake there was no power hookup so we ran off the batteries for about four hours. This RV does come with 120 Volt refrigerator and with a little bit of lights we ran it didn't take long to deplete their batteries. So I need some advice on what to buy for my power when I boondock. I know will be going solar in the near future, but the first thing I need to do is buy batteries that will run my Rv. Not to say that I'm on a budget but I don't wanna break the bank with lithium batteries be my best bet 100ah/200ah batteries. This RV does have the magnum energy 1000 Watt inverter in it and what I need to do anything else other than replace the batteries I have with the higher amp hour battery. This RV does have a generator so I have no problem of recharging the batteries but in the near future I would like to put some solar on the roof. Greatly would like to hear your all's input thank you for your time