house battery agm

Hi All!! 2016 Travato 59k diesel. I took out my house batteries to test them as they were draining quicker than normal when boondocking. The batteries have tested fine at 1hr 12hrs and 24hrs so I put them back in. Here is my problem I put them back in I believe the way they came out with all...

Q1. I may need new house batteries for 2016 59G. Other than removing batteries and taking them to store for testing, what is best way to test while still mounted under the 59G? Q2. If need new house batteries, is it best to replace with identical NAPA batteries or are there better alternatives?