With an
ECV the easiest thing would be an accessible room. Otherwise it will not fit through the door into your stateroom. Which would result in having to look for an appropriate storage space with the stateroom attendant where you could also load. There are some cut outs used for this, but it is non official and first come, first serve. Whatever happens; don't let the ECV out in the hallway. I know a very few CM's do advice this, sounds nice and peachy for yourself but can block off the halway from there for any and all needing to use a mobility aid or being large sized. Not an option, thus.
For rental; either rent at home if you need it at the airport and can't or don't want to manage with airport assistance. If renting at the port would be easier; contact
DCL special needs directly. While it's a brand new departure port for them, they should be able to inform you about which company they're working with. That way you can have the ECV waiting for you at either the port building or onboard (whatever needed and what has been made possible between DCL and ECV company).
NY isn't a port new to cruising, there have been plenty others that have cruised from there and have let their customers use rental ECV's onboard. Thus there must be options out there. Easiest tends to be to work with the cruisecompany, in this case DCL, to find out who they endorce and/or work with to make sure things go as smooth as possible.
If an accessible stateroom would be the better option; check in on it ASAP! It's short moment to get one already, most will book up very quickly. You can find forms online with DCL that you can fill out and have your doc sign so DCL knows what your needs are, that an accessible stateroom is needed etc. It's not a one-size-fits-all form, but needed for the accessible rooms and a good way to get started when working with certain needs, I've found.
Definately talk to DCL SN. Not because the TA isn't good at their job, but because the less people in the communicationline, the less chance of there being miscommunication. I've found it to be a great department to work with and very patient. Any questions regarding disabilities etc. is something they deal with. I've fired off quite a few odd and or very specific ones that would result in them having to investigate and/or contact specific persons or even physically check some things in the assigned stateroom. Never once a sigh or anything other but doing anything they can to make sure things were set for me and/or I'ld get the right info so I could make my own arrangements where need be.
Not sure if we're allowed to post these things on here, doubt it might be the smartest thing, but if you can't find it; sent me a pm for the mailadress or phonenumber.