Reddit reviews Bay Marine Supply Busbar – Large 4-Post 3/8" Power Distribution Block (250A Rating) – Red Bus Bar (with Complimentary Electrical Grease)
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Complimentary electrical grease (7g tube) is included to help prevent metal corrosion and gallingMax Amperage: 250A @ 12Vdc –– Max Voltage: 48VdcConnections: Four 3/8" Studs with Three #8-32 Steel ScrewsDimensions: 1.775 x 6.59 x 1.385 inch, (1.943 x 6.59 x 1.385 inch with cover)Nickel plated brass contact plate & stainless steel connection posts
It depends on the gauge wire you are talking about for I assume your inverter. I type locally run 2/0, so some of these blocks are not designed for that size cable.
Here is a example of a single post that you can crimp lugs to the cable. Put the three wires from the coach on the lug and the new wire from the battery to the post. When you put that many cables on the post you may run into spacing issues so you may need a washer or bolt to evenly stack the lugs.
Here is a example of a four post block. Simple and easy to install.
Finally if you don’t have lugs and want something easy a compact distribution block may help you.
I am not in your area so I can recommend anyone local. Most chain auto parts and home improvement stores don’t carry these types of items in-stock if at all. I send some Amazon links which may help you.