if you're not going to keep the trailer plugged into shore power, you need to install a battery disconnect switch.
otherwise, the parasitic power drains will empty your battery and you have the same issue again.
by the way, what's a Safe-t-alarm? is that a brand name?
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC