bob wrote:

I want to add a simple shore power hook-up.

snip

Absolutely the simplest, safest, most reliable, lowest cost system is a
simple extension cord.

Plug one end into shore power, bring the other end on board and plug the
coffee pot,etc into it.

You will need a 30A/15A adapter to accept the coffee pot, etc which is a
simple item to make.

Lew