FWIW I agree with you Chris. The winch could draw as much as say around 30 to 100 amps+ or more depending on its size and the load and since its to always be fed from the trailer battery anyway, (NOT the truck battery) there's no need to have a high current rated relay in that circuit. Conversely, the relay in the charging circuit only needs to be say around a 30 amp subject to the fuse and wiring from the truck battery back to the trailer battery.
As you noted, its only necessary to configure the circuit so when driving down the road the truck can charge the trailer battery and 20 to 30 amps can suffice for that. Then in order to prevent a high current draw by having the truck and trailer batteries remain in parallel when the winch is to be operated, the Normally Closed relay in the charging circuit can be opened (a simple 12 VDC feed via the winches activation relay circuit) upon activation of the winch.
As my sparky friend Jim noted JD intends to use different trucks to pull that same trailer so having the necessary relay back as part of the trailer wiring system makes most sense. Either a toggle switch or a relay can accomplish that but I prefer a relay so the breaking of the charging circuit is automatic versus possibly forgetting to flip the toggle switch each time.
If the charging circuit has a simple Normally Closed 30 amp 12 VDC coil operated relay back at the trailer, its simple to send it 12 volts to open the circuit anytime the Winch is activated and that should be easy as the winch itself probably has one of its own relay terminal that's hot when a button (raise or lower, in or out) is depressed.
Oh well, there are many many ways to do it and to each their own.
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