Welcome and best of luck!
Just a couple of observations on my part. I am sure you will get better advice soon.
Most SUVs and Pick Up Trucks do not compute when it comes to "good mileage". Especially commuting in NYC. Been there done that.
I would recommend you definitely pick your trailer first, then buy the appropriate Tow Vehicle. Keeping in mind that if you begin to love the RV Camping world you may want to upgrade your trailer soon. Then you are needing a bigger TV. We upgraded after 2 years.
From personal experience. Dinette seating is not conducive to anything but eating. If you have no where else to sit in your trailer. You will tire of it easily.
Again Best of Luck and have fun!