12 volt sealed batteries, for house bat.Pro/Con

We do dry camp for a few days on occasion, but mostly have at least an electric hookup. Last fall I replaced our two 12-volt maintenance free Walmart group 24 EverStart Marine coach batteries with Walmart group 29 MAXX Marine batteries. The batteries I replaced had been in service since 2005. The new batteries were made by Johnson Controls, the same company that makes batteries for Interstate.

Will an 12 volt, AGM work, with the progressive dynamics, PD9260C, converter/charger, with built in charge guard.

Chuck

You can use a smart(auto) charger on gels.

Just a bit of advice. Gel-cells require a charger designed for them. Charging at too high a rate will destroy them.
12 volt deep cycle batteries are available everywhere. Not to be confused with the hybrid "deep cycle/starting battery", which you do not want.

If you never dry camp, it just doesn't matter.
True Deep Cycle 12V are very expensive and difficult to locate.

If by sealed, you mean truly sealed like GelCel or AGM, the only disadvantage to these is that they are expensive.
The advantage is that no maintenance is ever required (actually can not be done) until replacement.

Matt