When it comes to storage batteries, you need a good battery not a cheap big box store battery. Trojan batteries have lead the market for a reason when it comes to OffTheGrid applications. The T-105 has earned the trust of RV campers for over 10 years, and we use them in our own rigs for several reasons.
Most RV batteries can't make it through the night just trying to run the furnace, a water pump and some lights, the biggest reason for this is they never get properly charged because the converters/built in battery chargers are not capable of reaching the battery manufactures required charging specs of 14.8v for most 12v flooded batteries or two Trojan T-105 6v batteries in series to make 12v. You need to check your specific battery on the manufactures website and see what the required absorb voltage is. A large percentage of them max out at 14.4 volts for a short period of time, then stay in float mode at 13.4 or so the entire time you're plugged into shore power or running that 7500 watt generator wasting fuel and pissing off your neighbors. So in short, you're slowing destroying your batteries if your rigs not on solar, and can reach the required voltage without a single sound.
Another problem with several batteries on the market is, even though the manufacture says to charge them at 14.8v, they cannot handle the voltage and you will be adding water every month. I had four 6v batteries in my coach that would use a gallon of water every other month between 4. I finally stepped up to Trojan 6v T-105's 4 years ago and every three to four months they only require about of cup of water between the four of them. They also reach 15v via solar very often in colder weather, so they can handle the required manufacture voltage.