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I have a 2023 130, and there are several where I keep it. I've seen quite a few configurations.

In my case I have a 6.5 gal under the std side of the helm bench. It has the factory tie down strap. Normally when I take it out, I bring a spare 6.5 tank with me but I haven't (yet) added a mounting strap for the second tank. I doubt I would ever need 13 gals since this boat is so good on gas. Crusing on plane at 20 mph, I'm burning about 2 GPH.

Another option would be to move the battery over to the stb side, and get a larger tank and strap that under the port side of the bench. Something like a Moeller 12-gal tank. I like it positioned where I can re-fuel without having to un-do the strap and move the tank(s).

As for plumbing, no one really plumbs them in series or anything like that. If you have two tanks, you just swap the plug over to use the other tank.

Phil T has a good point too. If you have the 6.5 that comes with it, and a portable red 5-gal tank (I must have a half dozen of those), then you can bring that along and re-fill your single tank if you need to. It would take a long trip in a 130 to drain the entire tank. The modern 4-stroke Merc 40 is really good on gas. I have an irrational fear of running out of gas so I always bring more than I need.

As to Lidokey's original point -- I've only had 4 people (my family) on board a couple of times, and it was hull speed in a busy area. It did okay with two adults in the back, one on the cooler seat and another on the bow cushion. But as soon as we tried an adult up front, the bow was too low for my liking.