You need to install a battery disconnect or install a battery tender, or leave the trailer plugged in 24/7. Even a 1 amp parasitic draw (LP detector, CO detector, Sound System standby etc) will draw down a battery by 24 AH every day. So after 4-5 days one single deep cycle (100-120 AH) battery will be dead.
2007 Surveyor SV230 - 200 Watts Solar/MPPT Controller - 230 AH Battery Bank - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting - Boon Docking 99% of the time.
2009 F150 - 5.4 Litre - 6 speed - Tow Package