I think Y-Landing (Captain's Cat birth home) is talking about what to order from the Factory. Most of what is mentioned above is "rigging" by a local dealer or done by a local marine service provider once the boat gets off of the trailer from the Factory. Unless of course, the factory is now proposing to get into the rigging business which, as far as I know, they are not.
That having been said, some of the above pertain. The "Icebox" - Norcold Refrigerator ad Dr. Bob mentioned. Have had one - useless. If it doesn't come installed from the factory, it's easy to add on a 22. On a 22, someone should buy the boat without it and add it if they feel they need it.
As Matt said, every owner wants and has (or thinks they have) the requirements for different stuff. If they're new, they usually don't have a clue and will come back to your for after the sale rigging (if you treated them right during the initial sale)
Y-Landing, order a basic boat and make some more $$ either for yourselves (If you have the capability) or refer the new buyer to a local place that can rig it as the owner wants. Don't try to be a new car dealer that doesn't have the capability to do much or to find a car that has all the options that a new buyer wants. That's not where the business is today, at least for boats... Good luck.
On my TC255, you took a basic boat, added a bunch of stuff for the first owner (Brock Howe), took his old engines from a previous boat, Suzi 115's, and sold it to him and sold it to me. I think you added the anchor windlass and a few other things too (I'd have to look at the invoice to see). There is money in there for your additions and you won't have to sell a boat with something on it that someone doesn't want. Plus, the more times he comes back to see how his new purchase is coming along, the more stuff he buys from your store...
KISS, don't try to anticipate your customers wants/needs/desires and get some boats on the floor!! Good luck!!
Charlie