Welcome to the forum! As you may know just turning off the battery disconnect switch will not shut off everything in the trailer. There will still be parasitic drains on the battery from the smoke detector, CO2 detector, and even the radio. The only real way to stop all draws is either disconnect the negative terminal from the battery, or add a disconnect switch on the negative cable. You probably need to load test your battery at this point because of the repeated discharge. As far as how many batteries, that will depend on what type of camping you do. If you boondock, you will need more amp hours, but if you use full hookups, then 1 may do the job. If you need to replace the battery, just remember to get a true deep cycle, not a starter battery CCA (cold cranking amps).
That is a huge trailer for that 2500 Ram! Specs say it is 18K which puts the pin weight around 4100 pounds. You are likely severely overloaded on your truck as I dont think the payload on that truck is anywhere near that. I know my 2500 is not. Good luck!
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Steve & Patti
2018 Grand Design Reflection 315 RLTS
2019 Chevy 2500 HD Diesel Z71
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