I have no-name sealed batteries under the stairs of my other RV...an older class "A" Damon. First thing I did was change the converter from a primitive and tired Magnatek to a 55 amp WFCO smart charger. It has three levels of charge. The lowest is a maintaining 13.2vdc.
I've not had a 12volt issue of any sort in three years with the two chassis batts and the engine batt. A modern WFCO should be fine.
Some ok with WFCO, some not. A lot of personal preference/convenience.
My new XLR 415 has a Progressive. It has a transformer that hums so loud with or without load I will have to switch it out. I will not let me rest.
Some ok with Progressive, some not. A lot of personal preference/convenience.
One poor performing cell in a bank of batteries will bring any converter to boil the batteries.
In three RV's I've purchased replacement WFCO's for the first two. In my third and newest I have to replace a Progressive.
All my RV's are connected 24/7...never boiled a battery. Most of my batteries last >7 years. Mtcyl batts around five as I have them on desulphators 24/7.
A voltmeter is your best friend.
Converters are similar to oil forums IMHO.
2014 XLR 415AMP, 2011 F350 Lariat 6.7 DRW, three bikes, NRA Benefactors.2013=180, 2014=184, 2015=216, 2016=220 jus' completed 7300 mile trek.