Charging Trailer Battery from Tow Vehicle?

If I want my trailer battery (Interstate Group 24 Deep Cycle) to be charged while we're driving, is it at simple as connecting the charge line from the tow vehicle (2014 Jeep Grande Cherokee with tow package and 7-pin plug) to the positive terminal of the battery? Let's assume that I'm disconnecting the trailer from the Jeep when parked to avoid draining the car battery. I've read posts about having a solenoid and/or fuse inline, but not sure if they're necessary or not in my case?



Thanks, Gary