A newish battery unintentionally drained super low once and not left there for too long or through freezing temperatures, should be able to recover much of its capacity/performance, but it will require bringing it upto 14.8v, holding it there for several hours, then perhaps bringing it upto 16 volts for 30 minutes.
No regular RV converter will do this and neither will 99% of so called smart chargers.
If you never camp without hookups then you certainly do not require a Rv/marine battery, and a cheaper lighter starter battery with a longer warranty will serve you just as well.
But Starter batteries have no threaded studs, only the automotive posts, and it might not simply be plug and play, and converting it to be plug an play with your system could cost more than the Marine version of the group 27.
Likewise your RV converter might never choose any voltage other than 13.6v, and this will never fully charge a battery drained to dead, slowly. more voltage for longer will be required, and a hydrometer dipped to verify when that voltage has been held for long enough, or if that higher voltage needs to be stepped up to Equalization levels(16v).
Depending on just how low you brought that battery, over how long of a period, and how new it was, you might be able to get it to respond and get your moneys worth from it, rather than simply replacing it.