The first question I would ask is "How are you measuring your battery
charge?". This will help determine if you are getting a full (100%) charge in the first place. Your best friend is a voltage monitor with at least a 4 digit display. Anything beyond that gets a bit overcomplicated and $$$.
Next is if you are attempting to run your refrigerator
on 12 VDC at any time, even when towing.
Your phone and your I-pad may draw up to 4 amps when both are on charge, this isn't a small amount of drain.
Overall a 1-2 year old battery
should not need replacement