keeping batteries charged

[steve james]

I've have a 1/2 ton Cougar 22rwsbe with 2- 6 volt batteries and have access to shore power, should I keep the trailer plugged in during the winter months ? or randomly pull the batteries and trickle charge them . Also while plugged in should I shut off the main battery discount and will shore power still charge the batteries ? Ive got conflicting answers from the dealer. thanks for any reply