need advice on House Battery Replacement.

I would replace your original batteries with a pair from Costco. Best return for your money.
I helped a friend with same unit as yours. Found that Jayco had mounted the Charge Wizard on top of the PD9180 converter. PD says to never do this. Putting on top of converter can cause converter to improperly charge batteries. Check yours out. Move it at least 12" away from convert.
Converter was also mounted on top of carpet. Cutting off air circulation. Put spacers under converter to help with cooling.

Hi,

It depends on what your usage is. Since I'm a power hog and use a medium large inverter (2500 watts) 12 volt jars work better for me.

A pair of true deep cycle batteries will serve you better than the RV/marine batteries. Easiest source is probably a pair of 6 volt golf cart batteries from Costco. You could also get a pair of 12 volt deep cycle batteries, but you'll have to go to a real battery store for those.

Normally COSCO, Walmart etc carry GC batteries.

Marine deep cycle are used for say trolling motors etc. You might look at the typical 6V golf cart (GC) battery which are deep cycle batteries. They might be the same footprint but are 1"+ higher. Plus they have to be wired in series. They are designed for the typical house battery type of usage.

There are many posts on this subject on these boards.

Thanks for the response. Yes, the specs came off the battery itself. So if these batteries are not deep cycle, is there a better replacement that is? They do say Deep Cycle on the battery label, but they also say Marine/RV, so it is a little confusing...

It sounds like 4 years is good for you, replace with the same batteries.

There are other options like GCs but they are slightly different size and wiring.

BTW Those specs are for starting batteries. Marine batteries are NOT deep cycle batteries but they are slightly better than starting batteries for house usage.