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If you let the battery voltage drop to 9 V very often they will soon be toast. Battery voltage is a very imprecise measure of state of charge, but having said that, when they get down to about 12.0 you need to stop and recharge as you don't want to go below 50% for best life.
I recently measured the stairway battery compartment on a Vegas. It was about 27" long by 9" wide by 10" tall. Two golf cart batteries would be your best choice, but they are too tall. A couple of Group 31 AGM batteries would be my next choice such as Renogy for about $450 for a pair from Amazon, much more for premium brands like Lifeline.
And for the most capacity irrespective of price, a couple of Battle Born Lithium batteries will give you more than double what you have now but for about $1,900 for a pair. Plus you can't harm them by discharging deeply like conventional batteries.
But you need to look into how much DC you are using and how you will replace it sooner than at 9 V.
David
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