With the 4 T105's I believe you have over 400 amp hours of storage. I have different batteries but the same amount of storage.
Here are some of my devices and the draw per hour. You should be able to use 200 amp hours (at least) without recharging.
24 inch tv/ powered ant. 2.5 amps
CPAP 2 amps
furnace 9 amps (when blower is on)
coffee maker 80 amps ( about 10 for one pot )
lights .5 - 3.5 amps
Many on this forum (myself included) would not leave home without a meter such as the Trimetric 2025.
I highly recommend you read Bob's blog on RV solar. Even if you don't have solar the part about batteries and charging and the install can be very helpful.
https://handybobsolar.wordpress.com/