JD, YES Id use a properly sized fuse or breaker at BOTH batteries is my short answer........
What you will be doing is essentially connecting the two batteries in parallel which is okay, however, when two batteries are to be wired in parallel it's BEST if the two are IDENTICAL in size and type and age etc. so one (the weaker) don't feed off the other PLUS they be wired and configured so both receive equal charge and equal loading to the best extent possible. Yes Billy Bob and Bubba who did otherwise and had no problems, I'm ONLY saying it can still "work" even if not wired the best possible way, but its best if done so.
AS far as wire size and overcurrent protection and for improved equal charging and loading, the bigger the wire connecting the two batteries the better to reduce line voltage drop. YES 10 gauge will "work" to provide some degree of charge to both batteries even if NOT equal.
NOTE when running wire from one to another more remote battery, especially if the run is long and/or the wire is small, and especially if the two batteries aren't identical, the chances of equal charging is reduced BUT YES YOUR IDEA STILL "WORKS".
Indeed if you use 10 Gauge wire having an ampacity of thirty amps, a 30 amp overcurrent protection device AT EACH BATTERY can suffice. An auto reset breaker has an advantage over having to replace a blown fuse HOWEVER if there's a fault it will just keep resetting and can fully discharge a battery where a blown fuse will clear the fault until you fix the problem and may NOT totally discharge the battery. YOUR CHOICE
Another consideration is whether or not the tow vehicle truck is to be left connected when operating the winches or hydraulics ?? Sure if connected and running the trucks alternator can deliver some degree of charging amps but the winch will be drawing current from the truck as well as the trailer batteries unless a diode is used.
For those who are under the mistaken impression the way batteries are wired in parallel makes no difference READ THE URL LINK TO SEE WHY IT MAKES A HUGEEEEEEEEEEEEE DIFFERENCE
As usual an electrical question draws out more opinions then most topics, mine included lol
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