I don't think interconnecting the two boat's DC systems is a good idea due to the long, large cables needed. You could take AC out of one boat and use it as "shore power" on the second boat.
Trying to understand here.
You want to use a multiplis ac out to another multiplus ac input to boost the battery on the second unit in the chain? Is this using the shore power through the first unit to the second?
@Kevin Windrem mentioned this ac to ac connection.
Yes you can if the charge limit (or input current limit) is down on the second unit so as to not overload the first unit or the input of the one on the shore limit.
You can't 'charge' a MultiPlus. A multiplus is a combined charger/inverter. It's not a battery.
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