You need Fuses/Breakers for the wire/s that go to them......no doubt. But, 30 amps? Is this what the manu recommends? Geeesh, those things winches? If 30 amps ea. is truly what is required, then 10 AWG is a bit on the light side.
I run Big Jon that require only 10 amps(yours could use 30, sounds high thou, check w manu) and use modified reset inlines for each individual DR's w the breakers at the power source. The motors themselves also have factory 10 amp manual reset CB's on each housing(pop out button Turkey is done type).
My reasons, and what works for me.....
Individually : Should one hang up or whatever and take out a breaker, the others continue to work. Might come in handy should you need them ALL(or the rest) up in a hurry while the one is being attended too, having one take down the rest, not good IMO.
For the inline breaker, "modified" or "manual" resets: You don't want the thing/s oscillating(auto reset type) on and off like crazy should it get hung up/over current, it pops off and stays off until load current/problem is cleared, manual reset would be okay too in an inline world but obviously needs easy access, however, modified can be buried.
All ran/breaker'd individually at a panel would work for me as well, I just don't have a panel area per-se.
