your federal formoza ct should be a good startCar tires are very popular with the trike community.
There is a catalog of information regarding car tires fitting the 1500, just google it. I am not sure what rim size you are running on the back of your trike.
My darkside tire is in my signature.
I am not sure if I could honestly recommend the Formosa tire to another 1500 rider and feel confident in doing so.your federal formoza ct should be a good start