The other option is an aluminum can. That is what most of the stuff
you see on the utility poles are and most new meter cans are aluminum
here.
===
One of the nice things about starboard is the lack of any external
shock hazzard. Also, there's no chance of corrosion and it seems to
be fairly UV resistant. The edges polish up nicely with wet and dry
sand paper.
I guess the down side is weight. The transformer will be over 200
pounds by itself.
I also assume it must comply with USCG 33 CFR
183.410.
I think I would give my chargers a real good look over to be sure they
can't be tapped for 220v. If you could run some of your stuff off of
your inverters, you might get by with a smaller transformer for the
stuff that won't.