Replacement Battery

Tony,

Why do you need a new battery for a 2-y.o. camper? 

Lead-Acid (Pb-SO4) batteries are still with us for very good reasons, one being cost.  A flooded cell Pb-SO4 battery will *generally* provide greater surge capacity, good for starting engines.  But they require water additions periodically and lose life if ever discharged below 50%.  An A_bsorbed G_lass M_at Pb-SO4 battery *generally* has a longer life, no/low maintenance and higher A-Hr capacity for a given size; they are considered spill-proof.  AGM batteries make good solar battery banks because they don't need to produce huge surge currents and are no maintenance.  AGMs cost a little more.  Gel based Pb-SO4 batteries are also spill proof, low/no maintenance and can be mounted in any orientation.  Because the gel can't circulate, they are not good candidates for starting duty and they are expensive. 

What you want is a deep cycle battery, sometimes called solar or trolling motor battery.  Their chemistry is a little different and allows discharge to 70% without undue damage.  If you buy an AGM Pb-SO4 battery, it will last longer and not need water.  I recommend the largest AGM(s) that will fit in the battery rack.  https://www.walmart.com/search/?query=deep%20cycle%20battery

My R-pod came with a 75 A-Hr Group 24 deep cycle 12V battery.  More A-Hrs won't hurt. 

ALL batteries need maintenance charging.  If left sitting a Pb-SO4 battery will self discharge at the rate of 5% to 16% a month (depending on temp).  I have a battery disconnect for my battery to keep the little bit of stuff that runs in the trailer from killing it.  Plus I added a 25 watt solar panel and a Battery Tender charge controller to keep it hot when not in use. 

Like most other upgrades, how much are you willing to spend to make this upgrade happen? And why do you prefer to get away from lead acid? (other than better performance) Unless you boondock (off-grid) alot, the standard lead acid batteries are normally adequate for most campers, most of the time.

And yes, they will work on shore power converters even is there is some blurb on the label that says it will work with (or was designed for) solar power.