I would be concerned about using a deep cycle for your starting battery(s). I would leave the two primary starting batteries as normal high capacity starting batteries for the truck and the winch. I would then add a deep cycle battery "house" battery for the fridge and other accessories.
I believe that most winch manufactures want the winch connected to the starting battery(s) to get enough amperage and voltage. Winches are not a deep cycle operation, when they nearing stall, they are high amperage applications that starting batteries are designed to support.