A good starting point is looking at the marketplace and see what is being offered there. You can also hire a broker to get you a deal if you want someone else to handle everything.
A third option is looking at the Signed! section of this forum.
I’m in a land trim with tow hitch (also Nj). I leased before they started charging sales tax.
Even with that, I have a hard time thinking over $800 for GT Line. My payment is around $625. Think I posted deal details in the forum when I leased it last fall