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300 ampere 45 volt power rectifier
The one you want comes from CanadaSTOP! LISTEN! LEARN!
Yes each rectifier is ten times the value of the 30 amp power supply.
The rectifier is SHOTTKY. And at that low an amperage the voltage DROP across this device is .21 volt, not .75 or greater as with a silicon device. This critter is CHEAP.
You connect one POSITIVE wire from ONE power supply to each of the towers on this rectifier. The holes in the towers are threaded. Yes the base plate then becomes "hot" +
You can find someplace to mount this in your RV can't you? It should be clamped to a four inch long heat sink. Two of the SHOTTKY rectifiers will support FOUR power supplies in style. That's over 130 amperes in charging power. And you set precisely the voltage of EACH power supply BEFORE connecting it to anything. A standard DMM will work fine for doing this.