Keyra,
I will try to answer both your questions. First the struts, they are not included on the NT units, I have seen them on other brands. They would not be difficult to install, I think there is a post under North Trail Modifications section of the forum that someone did this. Search there. The bike rack/rear bumper. Ours pulls out very easily once you remove the two pins. There are stops on the slide rail underneath to prevent you from pulling it all the way out, yours may be out of adjustment. Have your dealer look it over, that is what your warranty is for.
Good luck and enjoy your NT.